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2. Mobile number portability - Wikipedia

   en.wikipedia.org/wiki/Mobile_number_portability

   Overview. Mobile number portability is implemented in varying ways across the globe. The international and European standard implements "recipient-led" porting, in which a customer wishing to port a telephone number contacts the new network (recipient), which sends the number portability request (NPR) to the current network operator (donor).

3. Porting Authorisation Code - Wikipedia

   en.wikipedia.org/wiki/Porting_Authorisation_Code

   Porting Authorisation Code. Porting Authorization Code ( PAC) is a unique identifier (normally 9 characters long and in the format "ABC123456") used by some mobile network operators to facilitate mobile number portability (MNP). This allows users to retain their mobile telephone number when switching operators.

4. 5ESS Switching System - Wikipedia

   en.wikipedia.org/wiki/5ESS_Switching_System

   5ESS Switching System. 5ESS used in a mobile telephone network. The 5ESS Switching System is a Class 5 telephone electronic switching system developed by Western Electric for the American Telephone and Telegraph Company (AT&T) and the Bell System in the United States. It came into service in 1982 and the last unit was produced in 2003.

5. Local number portability - Wikipedia

   en.wikipedia.org/wiki/Local_number_portability

   Local number portability (LNP) for fixed lines, and full mobile number portability (FMNP) for mobile phone lines, refers to the ability of a "customer of record" of an existing fixed-line or mobile telephone number assigned by a local exchange carrier (LEC) to reassign the number to another carrier ("service provider portability"), move it to another location ("geographic portability"), or ...

6. AT&T investigating leak that dumped millions of customers ...

   www.aol.com/news/t-investigating-leak-dumped...

   March 30, 2024 at 8:35 PM. Pau Barrena. AT&T is investigating a leak earlier this month that dumped millions of customers’ data, including personal information such as Social Security numbers ...

7. Unstructured Supplementary Service Data - Wikipedia

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

   Unstructured Supplementary Service Data ( USSD ), sometimes referred to as " quick codes " or " feature codes ", is a communications protocol used by GSM cellular telephones to communicate with the mobile network operator 's computers. USSD can be used for WAP browsing, prepaid callback service, mobile-money services, location-based content ...

8. History of mobile phones - Wikipedia

   en.wikipedia.org/wiki/History_of_mobile_phones

   In 1949, AT&T commercialized Mobile Telephone Service. From its start in St. Louis, Missouri, in 1946, AT&T introduced Mobile Telephone Service to one hundred towns and highway corridors by 1948. Mobile Telephone Service was a rarity with only 5,000 customers placing about 30,000 calls each week. Calls were set up manually by an operator and ...

9. AT&T Wireless Services - Wikipedia

   en.wikipedia.org/wiki/AT&T_Wireless_Services

   AT&T Wireless Services, Inc., formerly part of AT&T Corporation, was a wireless telephone carrier founded in 1987 in the United States, based in Redmond, Washington, and later traded on the New York Stock Exchange under the stock symbol "AWE", as a separate entity from its former parent. On October 26, 2004, AT&T Wireless was acquired by ...