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2. Supplementary service codes - Wikipedia

   en.wikipedia.org/wiki/Supplementary_service_codes

   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.

3. Unstructured Supplementary Service Data - Wikipedia

   en.wikipedia.org/wiki/Unstructured_Supplementary...

   The user submits a code corresponding to the service available. USSD can be used to provide independent calling services such as a callback service (to reduce phone charges while roaming), enhance mobile marketing capabilities or interactive data services. USSD is commonly used by prepaid GSM cellular phones to query the available balance.

4. International Mobile Equipment Identity - Wikipedia

   en.wikipedia.org/wiki/International_Mobile...

   For example, the old style IMEI code 35-209900-176148-1 or IMEISV code 35-209900-176148-23 tells us the following: TAC: 35-2099 - issued by the BABT (code 35) with the allocation number 2099 FAC: 00 - indicating the phone was made during the transition period when FACs were being removed. SNR: 176148 - uniquely identifying a unit of this model

5. Talk:Unstructured Supplementary Service Data - Wikipedia

   en.wikipedia.org/wiki/Talk:Unstructured...

   Manufacturer defined MMI codes This is the category into which the much talked-about Samsung code falls. Codes specific to your phone model that have been built in by the manufacturer to, for example, activate service menus or reset the device. These codes also contain * and # characters.

6. Mobile dial code - Wikipedia

   en.wikipedia.org/wiki/Mobile_dial_code

   USSD (Unstructured Supplementary Service Data) codes [1] are mobile dial codes that can be used for communicating with the service provider's computers (i.e. for WAP browsing, prepaid callback service, mobile-money services, location-based content services, menu-based information services, and as part of configuring the phone on the network).

7. Type Allocation Code - Wikipedia

   en.wikipedia.org/wiki/Type_Allocation_Code

   The Type Allocation Code (TAC) is the initial eight-digit portion of the 15-digit IMEI and 16-digit IMEISV codes used to uniquely identify wireless devices. The Type Allocation Code identifies a particular model (and often revision) of wireless telephone for use on a GSM , UMTS , LTE , 5G NR , iDEN , Iridium or other IMEI-employing wireless ...