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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. Prepaid mobile phone - Wikipedia

   en.wikipedia.org/wiki/Prepaid_mobile_phone

   However, most prepaid phones now offer roaming using one of the following methods: The prepaid mobile phone user dials a "trigger" number from the foreign location using a USSD message which is not charged for while roaming. Upon receipt of the USSD, the customer's operator will then return the call.

4. Unstructured Supplementary Service Data - Wikipedia

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

   USSD is commonly used by prepaid GSM cellular phones to query the available balance. The vendor's "check balance" application hides the details of the USSD protocol from the user. On some pay as you go networks, such as Tesco Mobile, once a user performs an action that costs money, the user sees a USSD message with their new balance.

5. List of mobile virtual network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_virtual...

   Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.

6. Etisalat - Wikipedia

   en.wikipedia.org/wiki/Etisalat

   The company is known for its innovative products and services such as the Eco Sim and the first network to offer special numbers to Nigerians as their mobile numbers via the 0809uchoose campaign. From 2012 to 2015, Etisalat Nigeria hosted the Etisalat Prize for Innovation , established to promote African Internet expansion.

7. Jazz (mobile network operator) - Wikipedia

   en.wikipedia.org/wiki/Jazz_(mobile_network_operator)

   Jazz has over 14,000 active cell sites in the country, [10] with over 25,000 kilometers of fiber-optic cables laid. Huawei, Nokia-Siemens, and ZTE are the primary vendors for networking equipment at Jazz, including Radio Base Stations, microwave equipment and network switches.