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2. 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.

3. Mobile network codes in ITU region 3xx (North America)

   en.wikipedia.org/wiki/Mobile_network_codes_in...

   This list contains the mobile country codes and mobile network codes for networks with country codes between 300 and 399, inclusively – a region that covers North America and the Caribbean. Guam and the Northern Mariana Islands are included in this region as parts of the United States.

4. List of telecommunication companies in Pakistan - Wikipedia

   en.wikipedia.org/wiki/List_of_telecommunication...

   Postpaid & Prepaid Mobile Banking (S-Paisa) Government of Pakistan, Ministry of Information Technology and Telecommunication. 1.90 million Mobile virtual network operators (MVNO) 6 Onic 410 / 03 0339x 2G: 900 MHz (GPRS, EDGE) 3G: 900 MHz (UMTS, HSPA+) 4G: 1800 (B3) / 2100 (B1) MHz (LTE/LTE-A) Roams on SCO: Mobile Broadband Postpaid & Prepaid ...

5. List of telephone country codes - Wikipedia

   en.wikipedia.org/.../List_of_telephone_country_codes

   Worldwide distribution of country calling codes. Regions are coloured by first digit. Telephone country codes, originally termed International Codes by the International Telegraph and Telephone Consultative Committee (C.C.I.T.T.) in 1960, [1] but also sometimes referred to as "country dial-in codes", or historically "international subscriber dialing" (ISD) codes in the U.K., are telephone ...

6. Prepaid mobile phone - Wikipedia

   en.wikipedia.org/wiki/Prepaid_mobile_phone

   Typical sign showing where top-ups can be made. A prepaid mobile device, also known as a pay-as-you-go (PAYG), pay-as-you-talk, pay and go, go-phone, or prepay, is a mobile device such as a phone for which credit is purchased in advance of service use.

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.