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ETSI and 3rd Generation Partnership Project (3GPP) standards, such as GSM and LTE, define supplementary service codes that make it possible to query and set certain service parameters (e.g., call forwarding) directly from mobile devices.
The codes below are not USSD codes, these are the related Man-Machine Interface (MMI); they are standardized so they are the same on every GSM phone. They are interpreted by the handset first before a corresponding command (not the code itself) is sent to the network.
These codes are hardcoded into every GSM/UMTS/LTE device worldwide and cannot be changed by your network operator. Unstructured Supplementary Service Data (USSD) codes If you enter a code that at least ends in a hash sign (and press <SEND>) and is not recognized by the phones MMI parser, the code will be sent to the network verbatim.
For GSM/3GSM (UMTS) phones, the GSM standard defines the following forwarding Unstructured Supplementary Service Data. These were developed by ETSI and are based on standard European diversion codes and are similar to those used on most landlines in the EU: [6]
Cellular network standards and generation timeline. This is a comparison of standards of wireless networking technologies for devices such as mobile phones.A new generation of cellular standards has appeared approximately every tenth year since 1G systems were introduced in 1979 and the early to mid-1980s.
GSM Man-Machine Interface, a mobile telephony standard, see Unstructured Supplementary Service Data § Man-Machine Interface; Modified Mercalli intensity scale, an earthquake intensity measure; W3C MMI or Multimodal Interaction Activity; Monolithic Memories, Inc. (1969–1987), an American semiconductor manufacturer
The mechanism replaces GSM 7-bit default alphabet code table and/or extended table with a national table(s) according to special information elements in User Data Header. The non-segmented message using national language shift table(s) may carry up to 155 (or 153) 7-bit characters.
In mobile telephony GSM 03.38 or 3GPP 23.038 is a character ... Java regular expression for GSM 03.38 - Java regular expression for GSM 03.38 with code comments ...