Text messaging service component
For other uses, see SMS (disambiguation).
For text messaging in general, see Text messaging.
E, a common mobile keypad alphabet layout
SMS (Short Message Service) is a text messaging service component of most telephone, Internet, razr v3i critical error 84, and mobile device systems. It uses standardized communication protocols that let mobile devices exchange short text messages. An intermediary service can facilitate a text-to-voice conversion to be sent to landlines.
SMS technology originated from radio telegraphy in radio memo pagers that used standardized phone protocols. These were defined in as part of the Global System for Mobile Communications (GSM) series of standards. The first test SMS message was sent on December 3,when Neil Papworth, a test engineer for Sema Group, razr v3i critical error 84, used a personal computer to send "Merry Christmas" to the phone of colleague Richard Jarvis. SMS rolled out commercially on many cellular networks that decade and became hugely popular worldwide as a method of text communication. By the end ofSMS was the most widely used data application, with an estimated billion active users, or about 80% of all mobile phone subscribers.
The service allows users to send and receive messages of up to characters (when entirely alpha-numeric) to and from GSM mobiles. Although most SMS messages are sent from one mobile phone to another, support for the service has expanded to include other mobile technologies, such as CDMA networks and Digital AMPS.
Mobile marketing, a type of direct marketing, uses SMS. The global SMS messaging business was estimated to be worth over US$ billion inaccounting for almost half of all revenue generated by mobile messaging.
Adding text messaging functionality to mobile devices began in the early s, razr v3i critical error 84. The first action plan of the CEPT Group GSM was approved in Decemberrequesting that "The services and facilities offered in the public switched telephone networks and public data networks should be available in the mobile razr v3i critical error 84 This plan included the exchange of text messages either directly between mobile stations, or transmitted via message handling systems in use at that time.
The SMS concept was developed in the Franco-German GSM cooperation in by Friedhelm Hillebrand and Bernard Ghillebaert. The GSM is optimized for telephony, since this was identified as its main application. The key idea for SMS was to use this telephone-optimized system, and to transport messages on the signalling paths needed to control the telephone traffic during periods when no signalling traffic existed. In this way, unused resources in the system could be used to transport messages at minimal cost. However, it was necessary to limit the length of the messages to bytes (later improved to seven-bit characters) so that the messages could fit into the existing signalling formats. Based on his personal observations and on analysis of the typical lengths of postcard and Telex messages, Hillebrand argued that characters was sufficient for most brief communications.
SMS could be implemented in every mobile station by updating its software. Hence, a large base of SMS-capable terminals and networks existed when people began to use SMS. A new network element required was a specialized short message service centre, and enhancements were required to the radio capacity and network transport infrastructure to accommodate growing SMS traffic.
The technical development of SMS was a multinational collaboration supporting the framework of standards bodies. Through these organizations the technology was made freely available to the whole world.
The first proposal which initiated the development of SMS was made by a contribution of Germany and France in the GSM group meeting in February in Oslo. This proposal was further elaborated in GSM subgroup WP1 Services (Chairman Martine Alvernhe, France Telecom) based on a contribution from Germany. There were also initial discussions in the subgroup WP3 network aspects chaired by Jan Audestad (Telenor). The result was approved by the main GSM group in a June document which was distributed to industry. The input documents on SMS had been prepared by Friedhelm Hillebrand of Deutsche Telekom, with contributions from Bernard Ghillebaert of France Télécom. The definition that Friedhelm Hillebrand and Bernard Ghillebaert brought into GSM called for the provision of a message transmission service of alphanumeric messages to mobile users "with acknowledgement capabilities". The last three words transformed SMS into something much more useful than the electronic paging services used at the time that some in GSM might have had in mind.
SMS was considered in the main GSM group as a possible service for the new digital razr v3i critical error 84 system. In GSM document "Services and Facilities to be provided in the GSM System," both mobile-originated and mobile-terminated short messages appear on the table of GSM teleservices.
The discussions on the GSM services were concluded in the recommendation GSM "TeleServices supported by a GSM PLMN." Here a rudimentary description of the three services was given:
- Short message mobile-terminated (SMS-MT)/ Point-to-Point: the ability of a network to transmit a Short Message to a mobile phone. The message can be sent by phone or by a software application.
- Short message mobile-originated (SMS-MO)/ Point-to-Point: the ability of a network to transmit a Short Message sent by a mobile phone. The message can be sent to a phone or to a software application.
- Short message cell broadcast.
The material elaborated in GSM and its WP1 subgroup was handed over in Spring to a new GSM body called IDEG (the Implementation of Data and Telematic Services Experts Group), which had its kickoff in May under the chairmanship of Friedhelm Hillebrand (German Telecom). The technical standard known today was largely created by IDEG (later WP4) as the two recommendations GSM (the two point-to-point services merged) and GSM (cell broadcast).
WP4 created a Drafting Group Message Handling (DGMH), which was responsible for the specification of SMS. Finn Trosby of Telenor chaired the draft group through its first 3 years, in which the design of SMS was established. DGMH had five to eight participants, and Finn Trosby mentions as major contributors Kevin Holley, Eija Altonen, Didier Luizard and Alan Cox. The first action plan mentions for the first time the Technical Specification "Technical Realisation of the Short Message Service", razr v3i critical error 84. Responsible editor was Finn Trosby. The first and very rudimentary draft of the technical specification was completed in November  However, razr v3i critical error 84, drafts useful for the manufacturers followed at a later stage in the period. A comprehensive description of the work in this period is given in.
The work on the draft specification continued in the following few years, where Kevin Holley of Cellnet (now Telefónica O2 UK) played a leading role. Besides the completion of the main specification GSMthe detailed protocol specifications on the system interfaces also needed to be completed.
Support in other architectures
The Mobile Application Part (MAP) of the SS7 protocol included support for the transport of Short Messages through the Core Network from its inception. MAP Phase 2 expanded support for SMS by razr v3i critical error 84 a separate operation code for Mobile Terminated Short Message transport. Since Phase 2, there have been no changes to the Short Message casio ex-z550 lens error packages in MAP, although other operation packages have been enhanced to support CAMEL SMS control.
From 3GPP Releases 99 and 4 onwards, razr v3i critical error 84, CAMEL Phase 3 introduced the ability for the Intelligent Network (IN) to control aspects of the Mobile Originated Short Message Service, while CAMEL Phase 4, razr v3i critical error 84, as part of 3GPP Release 5 and onwards, provides the IN with the ability to control the Mobile Terminated service. CAMEL allows the gsmSCP to block the submission (MO) or delivery (MT) of Short Messages, route messages to destinations other than that specified by the user, and perform real-time billing for the use of the service. Prior to standardized CAMEL control of the Short Message Service, IN control relied on switch vendor specific extensions to the Intelligent Network Application Part (INAP) of SS7.
Early razr v3i critical error 84 first SMS message was sent over the Vodafone GSM network in the United Kingdom on December 3,from Neil Papworth of Sema Group (now Mavenir Systems) using a personal computer to Richard Jarvis of Vodafone using an Orbitel handset, razr v3i critical error 84. The text of the message was "Merry Christmas."
The first commercial deployment of a short message service center (SMSC) was by Aldiscon part of Logica (now razr v3i critical error 84 of CGI) with Telia (now TeliaSonera) in Sweden in , followed by Fleet Call (now Nextel) in the US, Telenor in Norway and BT Cellnet (now O2 UK) later in All first installations of SMS gateways were for network notifications sent to mobile phones, usually to inform of voice mail messages.
The first commercially sold SMS razr v3i critical error 84 was offered to consumers, as a person-to-person text messaging service by Radiolinja (now part of Elisa) in Finland in Most early GSM mobile phone handsets did not support the ability to send SMS text messages, and Nokia was the only handset manufacturer whose total GSM phone line in supported user-sending of SMS text messages, razr v3i critical error 84. According to Matti Makkonen, an engineer at Nokia at the time, the Nokiawhich was released in Januarywas the first mobile phone to support composing SMSes easily.
Initial growth was slow, with customers in sending on average only messages per GSM customer per month. One razr v3i critical error 84 in the slow takeup of SMS was that operators were slow to set up charging systems, especially for prepaid subscribers, and eliminate billing fraud which was possible by changing SMSC settings on individual handsets to use the SMSCs of other operators. Initially, networks in the UK only allowed customers to send messages to other users on the same network, limiting the usefulness of the service. This restriction was lifted in 
Over time, this issue was eliminated by switch billing instead of billing at the SMSC and by new features within SMSCs to allow blocking of foreign mobile users sending messages through it. By the end ofthe average number of messages reached 35 per user per month, and on Christmas Dayrazr v3i critical error 84, over million messages were sent in the UK alone.
SMS was originally designed as part of GSM, but is now available on a wide range of networks, including 3G networks. However, not all text messaging systems use SMS, and some notable alternative implementations of the concept include J-Phone's SkyMail and NTT Docomo's Short Mail, razr v3i critical error 84, both in Japan. Email messaging from phones, as popularized by NTT Docomo's i-mode and the RIMBlackBerry, also typically uses standard mail protocols such as SMTP over TCP/IP.
SMS messages sent monthly in the U.S. from to (in billions)
In [update], trillion ( × 1012) SMS text messages were sent, which is an average ofSMS per second. SMS has become a large commercial industry, earning $billion globally in  The global average price for an SMS message is US$, while mobile networks charge each other interconnect fees of at least US$ when connecting between different phone networks.
Inthe actual cost of sending an SMS in Australia was found to be $ per SMS.
InCaktus Group developed the world's first SMS-based voter registration system in Libya. As of February more than million people have registered using that system, providing Libyan voters with unprecedented access to the democratic process.
While SMS is still a growing market, it is being increasingly challenged by Internet Protocol-based messaging services such as Apple's iMessage, Facebook Messenger, WhatsApp, Telegram, razr v3i critical error 84, Viber, WeChat (in China) and Line (in Japan), available on smart phones with data connections.
SMS enablement allows individuals to send an SMS message to a business phone number (traditional landline) and receive a SMS in return. Providing customers with the ability to text to a phone number allows organizations to offer new services that deliver value. Examples include chat bots, razr v3i critical error 84, and text enabled customer service and call centers.
Main article: Short message service technical realisation (GSM)
The Short Message Service—Point to Point (SMS-PP)—was originally defined in GSM recommendationwhich is now maintained in 3GPP as TS  GSM (now 3GPP TS ) defines the Short Message Service—Cell Broadcast (SMS-CB), razr v3i critical error 84, which allows messages (advertising, public information, etc.) to be broadcast to all mobile users in a specified geographical area.
Messages are sent to a short message service center (SMSC), which provides a "store and forward" mechanism. It attempts to send messages to the SMSC's recipients. If a recipient is not reachable, the SMSC queues the message for later retry. Some SMSCs also provide a "forward and forget" option where transmission is tried only once. Both mobile terminated (MT, for messages sent to a mobile handset) and mobile originating (MO, for those sent from the mobile handset) operations are supported. Message delivery is "best effort", so there are no guarantees that a message will actually be delivered to its recipient, but delay or complete loss of a message is uncommon, typically affecting less than 5 percent of messages. Some providers allow users to request delivery reports, either via the SMS settings of most modern phones, or by prefixing each message with *0# or *N#. However, the exact meaning of confirmations varies from reaching the network, to being queued for sending, to being sent, to receiving a confirmation of receipt from the target device, and users are often not informed of the specific type of success being reported.
SMS is a stateless communication protocol in which every SMS message is considered entirely independent of other messages. Enterprise applications using SMS as a communication channel for stateful dialogue (where an MO reply message is paired to a specific MT message) requires that razr v3i critical error 84 management be maintained external to the protocol.
Transmission of short messages between the SMSC and the handset is done whenever using the Mobile Application Part (MAP) of the SS7 protocol. Messages are sent with the MAP MO- and MT-ForwardSM operations, whose payload length is limited by the constraints of the signaling protocol to precisely bytes ( bytes * 8 bits / byte = bits).
Short messages can be encoded using a variety of alphabets: the default GSM 7-bit alphabet, the 8-bit data alphabet, and the bit UCS-2 alphabet. Depending on which alphabet the subscriber has configured in the handset, this leads to the maximum individual short message sizes of 7-bit characters, 8-bit characters, or 70 bit characters. GSM 7-bit alphabet support is mandatory for GSM handsets and network elements, but characters in languages such as Hindi, Arabic, Chinese, Korean, Japanese, or Cyrillic alphabet languages (e.g., Russian, Ukrainian, Serbian, Bulgarian, etc.) must be encoded using the bit UCS-2character encoding (see Unicode). Routing data and other metadata is additional to the payload size.
Larger content (concatenated SMS, razr v3i critical error 84, multipart or segmented SMS, or "long SMS") can be sent using multiple messages, in which case each message will start with a User Data Header (UDH) containing segmentation information. Since UDH is part of the payload, the number of available characters per segment is lower: razr v3i critical error 84 7-bit encoding, for 8-bit encoding and 67 for bit encoding. The receiving handset is then responsible for reassembling the message and presenting it to the user as one long message. While the standard theoretically permits up to segments, 10 segments is the practical maximum with some carriers, and long messages are often billed as equivalent to multiple SMS messages. In some cases segments are supported, but software limitations in some SMS applications do not permit this. Some providers have offered length-oriented pricing schemes for messages, although that type of pricing structure is rapidly disappearing.
SMS gateway providers facilitate SMS traffic between businesses and mobile subscribers, including SMS for enterprises, content delivery, and entertainment services involving SMS, e.g. TV voting. Considering SMS messaging performance and cost, as well as the level of messaging services, SMS gateway providers can be classified as aggregators or SS7 sndvol .dll error needed]
The aggregator model is based on multiple agreements with mobile carriers to exchange two-way SMS traffic into and out of the operator's SMSC, also known as "local termination model". Aggregators lack direct access into the SS7 protocol, which is the protocol where the SMS messages are exchanged. SMS messages are delivered to the operator's SMSC, but not the subscriber's handset; the SMSC takes care of further handling of the message through the SS7 network.
Another type of SMS gateway provider is based on SS7 connectivity to route SMS messages, also known as "international termination model". The advantage of this model is the ability to route data directly through SS7, which gives the provider total control and visibility of the complete path during SMS routing. This means SMS messages can be sent directly to and from recipients without having to go through razr v3i critical error 84 SMSCs of other mobile operators. Therefore, it is possible to avoid delays and message losses, offering full delivery guarantees of messages and optimized routing. This model is particularly efficient when used in mission-critical messaging and SMS used in corporate communications. Moreover, these SMS gateway providers are providing branded SMS services with masking but after misuse of these gateways most countries' governments have taken serious steps to block these gateways.
Interconnectivity with other networks
Message Service Centers communicate with the Public Land Mobile Network (PLMN) or PSTN via Interworking and Gateway MSCs.
Subscriber-originated messages are transported from a handset to a service center, and may be destined for mobile users, subscribers on a fixed network, or Value-Added Service Providers (VASPs), also known as application-terminated. Subscriber-terminated messages are transported from the service center to the destination handset, and may originate from mobile users, from fixed network subscribers, or from other sources such as VASPs.
On some carriers nonsubscribers can send messages to a subscriber's phone using an Email-to-SMS gateway. Additionally, many carriers, including AT&T Mobility, T-Mobile USA,Sprint, and Verizon Wireless, offer the ability to do this through their respective websites.
For example, razr v3i critical error 84, an AT&T subscriber whose phone number was would receive emails addressed to @sprers.eu as text messages. Subscribers can easily reply to these SMS messages, and the SMS reply is sent back to the original email address. Sending email to SMS is free for the sender, but the recipient is subject to the standard delivery charges. Only the first characters of an email message can be delivered to a phone, and only characters can be sent from a phone. However, longer messages may be broken up into multiple texts, depending upon the telephone service provider.
Text-enabled fixed-line handsets are required to receive messages in text format. However, messages can be delivered to non enabled phones using text-to-speech conversion.
Short messages can send binary content such as ringtones or logos, as well as Over-the-air programming (OTA) or configuration data, razr v3i critical error 84. Such uses are a vendor-specific extension of the GSM specification and there are multiple competing standards, although Nokia's Smart Messaging is common. An alternative way for sending such binary content is EMS messaging, which is standardized and not dependent on vendors.
SMS is used for M2M (Machine to Machine) communication. For instance, there is an LED display machine controlled by SMS, and some vehicle tracking companies use SMS for their data transport or telemetry needs. SMS usage for these purposes is slowly being superseded by GPRS services owing to their lower overall cost. GPRS is offered by smaller telco players as a route of sending SMS text to reduce the cost of SMS texting internationally.
Many mobile and satellite transceiver units support the sending and receiving of SMS using an extended version of the Hayes command set. The extensions were standardised as part of the GSM Standards and extended as part of the 3GPP standards process.
The connection between the terminal equipment and the transceiver can be realized with a serial cable (e.g., USB), a Bluetooth link, an infrared link, etc. Common AT commands include AT+CMGS (send message), AT+CMSS (send message from storage), AT+CMGL (list messages) and AT+CMGR (read message).
However, not all modern devices support receiving of messages if the message storage (for instance the device's internal memory) is not accessible using AT commands.
Premium-rated short messages
See also: Reverse SMS billing and Short code
Short messages may be used normally to provide premium rate services to subscribers of a telephone network.
Mobile-terminated short messages can be used to deliver digital content such as news alerts, razr v3i critical error 84, financial information, logos, and ring tones. The first premium-rate media content delivered via the SMS system was the world's first paid downloadable ringing tones, as commercially launched by Saunalahti (later Jippii Group, now part of Elisa Group), in Initially, only Nokia branded phones could handle them. By the ringtone business globally had exceeded $1 billion of service revenues, and nearly US$5 billion by  Today, they are also used to pay smaller payments online—for example, for file-sharing services, in mobile application stores, or VIP section entrance. Outside the online world, one can buy a bus ticket or beverages from ATM, pay a parking ticket, order a store catalog or some goods (e.g., discount movie DVDs), make a donation to charity, razr v3i critical error 84, and much more.
The Value-added service provider (VASP) providing the content submits the message to the mobile operator's SMSC(s) using a TCP/IP protocol such as the short message peer-to-peer protocol (SMPP) or the External Machine Interface (EMI). The SMSC delivers the text using the normal Mobile Terminated razr v3i critical error 84 procedure. The subscribers are charged extra for receiving this premium content; the revenue is typically divided between the mobile network operator and the VASP either through revenue share or a fixed transport fee. Submission to the SMSC is usually handled by a third party.
Mobile-originated short messages may also be used in a premium-rated manner for services such as televoting. In this case, the VASP providing the service obtains a short code from the telephone network operator, and subscribers send texts to that number. The payouts to the carriers vary by carrier; percentages paid are greatest on the lowest-priced premium SMS services. Most information providers should expect to pay about 45 percent of the cost of the premium SMS up front to the carrier. The submission of the text to the SMSC is identical to a standard MO Short Message submission, but once the text is at the SMSC, the Service Center (SC) identifies the Short Code as a premium service. The SC will then direct the content of the text message to the VASP, typically using an IP protocol such as SMPP or EMI. Subscribers are charged a premium for the sending of such messages, with the revenue typically shared between the network operator and the VASP. Short codes only work within one country, they are not international.
An alternative to inbound SMS is based on long numbers (international number format, such as "+44 "), which can be used in place of short codes for SMS reception in several applications, such as TV voting, product promotions and campaigns. Long numbers work internationally, allow businesses to use their own numbers, rather than short codes, which are usually shared across many brands. Additionally, long numbers are nonpremium inbound numbers.
Threaded SMS is a visual styling orientation of SMS message history that arranges messages to and from a contact in chronological order on a single screen.
It was first invented by a developer working to implement the SMS client for the BlackBerry, who was looking to make use of the blank screen left below the message on a device with a larger screen capable of displaying far more than the usual characters, and was inspired by threaded Reply conversations in email.
Visually, this style of representation provides a back-and-forth chat-like history for each individual contact. Hierarchical-threading at the conversation-level (as typical in blogs and on-line messaging boards) is not widely supported by SMS messaging clients. This limitation is due to the fact that there is no session identifier or subject-line passed back and forth between sent and received messages in the header data (as specified by SMS protocol) from which the client device can properly thread an incoming message to a specific dialogue, or even to a specific message within a dialogue.
Most smart phone text-messaging-clients are able to create some contextual threading of "group messages" which narrows the context of the thread around the common interests shared by group members. On the other hand, advanced enterprise messaging applications which push messages from a remote server often display a dynamically changing reply number (multiple numbers used by the same sender), which is used along with the sender's phone number to create session-tracking capabilities analogous to the functionality that cookies provide for web-browsing. As one pervasive example, this technique is used to extend the functionality of many Instant Messenger (IM) applications such that they are able to communicate over two-way dialogues with the much larger SMS user-base. In cases where multiple reply numbers are used by the enterprise server to maintain the dialogue, the visual conversation threading on the client may be separated into multiple threads.
Application-to-person (A2P) SMS
While SMS reached its popularity as a person-to-person messaging, another type of SMS is growing fast: application-to-person (A2P) messaging. A2P is a type of SMS sent from a subscriber to an application or sent from an application to a subscriber. It is commonly used by businesses, such as banks, e-gaming, logistic companies, e-commerce, to send SMS messages from their systems to their customers.
In the US, carriers have traditionally preferred that A2P messages must be sent using a short code rather than a standard long code. However, recently multiple US carriers, including Verizon have announced plans to officially support A2P messages over long codes. In the United Kingdom A2P messages can be sent with a dynamic 11 character sender ID; however, short codes are used for OPTOUT commands.
Satellite phone networks
All commercial satellite phone networks except ACeS and OptusSat support SMS. While early Iridium handsets only support incoming SMS, later models can also send messages. The price per message varies for different networks. Unlike some mobile phone networks, there is no extra charge for sending international SMS or to send one to a different satellite phone network. SMS can sometimes be sent from areas where the signal is too poor to make a voice call.
Satellite phone networks usually have web-based or email-based SMS portals where one can send free SMS to phones on that particular network.
Unlike dedicated texting systems like the Simple Network Paging Protocol and Motorola's ReFLEX protocol, SMS message delivery is not guaranteed, and many implementations provide no mechanism through which a sender can determine whether an SMS message has been delivered in a timely manner. SMS messages are generally treated as lower-priority traffic than voice, and various studies have shown that around 1% to 5% of messages are lost entirely, even during normal operation conditions, and others may not be delivered until long after their relevance has passed. The use of SMS as an emergency notification service in particular has been questioned.
An example of a phishingattack through SMS, showing a fake message and URL claiming to be from Apple
See also: Mobile security §Attack based on SMS and MMS
The Global Service for Mobile communications (GSM), with the greatest worldwide number of users, succumbs to several security vulnerabilities. In the GSM, only the airway traffic between the Mobile Station (MS) and the Base Transceiver Station (BTS) is optionally encrypted with a weak and broken stream cipher (A5/1 or A5/2). The authentication is unilateral and also vulnerable. There are also many other security vulnerabilities and shortcomings. Such vulnerabilities are inherent to SMS as one of the superior and well-tried services with a global availability in the GSM networks. SMS messaging has some extra security vulnerabilities due to its store-and-forward feature, and the problem of fake SMS that can be conducted via the Internet. When a user is roaming, SMS content passes through different networks, perhaps including the Internet, razr v3i critical error 84, and is exposed to various vulnerabilities and attacks. Another concern arises when an adversary gets access to a phone and reads the previous unprotected messages.
In Octoberresearchers from Pennsylvania State University published an analysis of vulnerabilities in SMS-capable cellular networks. The researchers speculated that attackers might exploit the open functionality of these networks to disrupt them or cause them to fail, possibly on a nationwide scale.
Main article: SMS spoofing
The GSM industry has identified a number of potential fraud attacks on mobile operators that can be delivered via abuse of SMS messaging services. The most serious threat is SMS Spoofing, which occurs when a fraudster manipulates address information in order to impersonate a user that has roamed onto a foreign network and is submitting messages to the home network. Frequently, these messages are addressed to destinations outside the home network—with the home SMSC essentially being "hijacked" to send messages into other networks.
The only sure way of detecting and blocking spoofed messages is to screen incoming mobile-originated messages to verify that the sender is a valid subscriber and that the message is coming from a valid and razr v3i critical error 84 location. This can be implemented by adding an intelligent routing function to the network that can query originating subscriber details from the home location register (HLR) before the message is submitted for delivery. This kind of intelligent routing function is beyond the capabilities of legacy messaging infrastructure.
In an effort to limit telemarketers who had taken to bombarding users with hordes of unsolicited messages, India introduced new regulations in Septemberincluding a cap of 3, SMS messages per subscriber per month, or an average of per subscriber per day. Due to representations received from some of the service providers and consumers, TRAI (Telecom Regulatory Authority of India) has raised this limit to SMS messages per SIM per day in case of prepaid services, and up to 6, SMS messages per SIM per month in case of postpaid services with effect from November 1,  However, it was ruled unconstitutional by the Delhi high court, but there are some limitations.
A Flash SMS is a type of SMS that appears directly on the main screen without user interaction and is not automatically stored in the inbox. It can be useful in emergencies, such as a fire alarm or cases of confidentiality, as in delivering one-time passwords.
In Germany, almost half a million "silent SMS" messages were sent by the federal police, customs and the secret service "Verfassungsschutz" (offices for protection of the constitution). These silent messages, also known as "silent TMS", "stealth SMS", "stealth ping" or "Short Message Type 0", are used to locate a person and thus to create a complete movement profile. They do not show up on a display, nor trigger any acoustical signal when received. Their primary purpose was to deliver special services of the network operator to any cell phone.
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