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2. AT&T Mobility - Wikipedia

   en.wikipedia.org/wiki/AT&T_Mobility

   Cingular 3G UMTS SIM card. In California, Nevada, Northern New Jersey and New York City, Cingular and T-Mobile USA maintained and shared a GSM-1900 network prior to the acquisition of AT&T Wireless, through a joint venture known as GSM Facilities. The network sharing agreement allowed Cingular to offer local service in northern New Jersey and ...

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

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

   Originally BellSouth Mobility DCS, then Cingular Wireless, [82] then Aio Wireless, then rebranded as the new GSM Cricket Wireless: 310: 160: T-Mobile: T-Mobile US: Operational: GSM 1900 [82] GSM to shut down Sep 2024 [140] 310: 170: AT&T: AT&T Mobility: Operational: GSM 1900: Formerly Pacific Bell Wireless, then Cingular Wireless [82] CA/NV ...

4. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   A typical SIM card (mini-SIM with micro-SIM cutout) T-Mobile nano-SIM card with NFC capabilities in the SIM tray of an iPhone 6s cell phone A SIM (Subscriber Identity Module) card is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone ...

5. List of mobile network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_network...

   Each active SIM card is considered a subscriber. [7] Wholesale customers include users of machine to machine networks and mobile virtual network operators that operate on the host network, but are managed by wholesale partners. Subscriber counts are sourced from each companies quarterly reports.

6. UMTS - Wikipedia

   en.wikipedia.org/wiki/UMTS

   The Universal Mobile Telecommunications System (UMTS) is a 3G mobile cellular system for networks based on the GSM standard. Developed and maintained by the 3GPP (3rd Generation Partnership Project), UMTS is a component of the International Telecommunication Union IMT-2000 standard set and compares with the CDMA2000 standard set for networks based on the competing cdmaOne technology.

7. Comparison of mobile phone standards - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_mobile_phone...

   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.