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The value shall start at 1 and increment for every short message which makes up the concatenated short message. If the value is zero or greater than the value in Field 5 then the receiving entity shall ignore the whole information element. [ETSI Specification: GSM 03.40 Version 5.3.0: July 1996] Example of the UDH for an sms split into two parts:
SMS (short message service) is a text messaging service component of most telephone, Internet, and mobile device systems. It uses standardized communication protocols to enable mobile devices to exchange short text messages. An intermediary service can facilitate a text-to-voice conversion to be sent to landlines.
Voice short codes enable UK mobile phone users to dial a 5-digit short code (usually beginning 6, 7 or 8 - e.g. 61500) as an alternative to a standard geographic (e.g. 01 or 02 prefix) or non-geographic (e.g. 03, 08 or 09 prefix) long number.
Messages (formerly Text) is a text messaging software application developed by Apple Inc. for its macOS, iOS, iPadOS, watchOS, and visionOS operating systems.. All version of Messages support Apple's own iMessage service, while the mobile version of Messages on iOS – used on iPhone and cellular-enabled models of the iPad – also supports SMS, MMS, and RCS in iOS 18. [1]
Short codes, or short numbers, are short digit-sequences—significantly shorter than telephone numbers—that are used to address messages in the Multimedia Messaging System (MMS) and short message service (SMS) systems of mobile network operators. [1] In addition to messaging, they may be used in abbreviated dialing.
When a user sends a text message (SMS message) to another user, the message gets stored in the SMSC (Short Message Service Center), which delivers it to the destination user when they are available. This is a store and forward option. An SMS center (SMSC) is responsible for handling the SMS operations of a wireless network.
The MMS standard extends the core SMS (Short Message Service) capability, allowing the exchange of text messages greater than 160 characters in length. Unlike text-only SMS, MMS can deliver a variety of media, including up to forty seconds of video, one image, a slideshow [2] of multiple images, or audio.
Cell Broadcast (CB) is a method of simultaneously sending short messages to multiple mobile telephone users in a defined area. It is defined by the ETSI's GSM committee and 3GPP and is part of the 2G, 3G, 4G and 5G standards. [1] It is also known as Short Message Service-Cell Broadcast (SMS-CB or CB SMS). [2] [3]