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2. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   SIM cards are identified on their individual operator networks by a unique international mobile subscriber identity (IMSI). Mobile network operators connect mobile phone calls and communicate with their market SIM cards using their IMSIs. The format is: The first three digits represent the Mobile country code (MCC).

3. Wikipedia

   en.wikipedia.org/wiki/How-to-activate-sim-card-att

   Wikipedia

4. eSIM - Wikipedia

   en.wikipedia.org/wiki/ESIM

   An eSIM ( embedded SIM) is a form of SIM card that is embedded directly into a device. Instead of an integrated circuit located on a removable SIM card, typically made of PVC, an eSIM consists of software installed onto an eUICC chip permanently attached to a device. If the eSIM is eUICC-compatible, it can be re-programmed with new SIM information.

5. AT&T Mobility - Wikipedia

   en.wikipedia.org/wiki/AT&T_Mobility

   AT&T Mobility. AT&T Mobility, LLC, also known as AT&T Wireless and marketed as simply AT&T, is an American telecommunications company. It is a wholly owned subsidiary of AT&T Inc. and provides wireless services in the United States. AT&T Mobility is the largest wireless carrier in the United States, with 241.5 million subscribers as of December ...

6. H2O Wireless - Wikipedia

   en.wikipedia.org/wiki/H2O_Wireless

   www .h2owireless .com. h2o Wireless is a United States-based prepaid cell phone service, that utilizes the AT&T network. [2] It is a brand of mobile virtual network operator (MVNO) Locus Telecommunications, a subsidiary of Telrite Holdings, Inc., since 2019. [1] [3] Locus was formerly a subsidiary of KDDI America corporation, starting in 2010.

7. SIM lock - Wikipedia

   en.wikipedia.org/wiki/SIM_lock

   A SIM lock, simlock, network lock, carrier lock or ( master) subsidy lock is a technical restriction built into GSM and CDMA [1] mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks. This is in contrast to a phone (retrospectively called SIM-free or ...

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

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

   AT&T: AT&T Mexico: Not operational: iDEN 800: Former Nextel; shut down 2017: 334: 020: Telcel: América Móvil: Operational: UMTS 850 / UMTS 1900 / LTE 850 / LTE 1700 / LTE 2600 / 5G 3500: former Radiomóvil Dipsa; GSM shut down Sep 2020: 334: 030: Movistar: Telefónica: Operational: MVNO: former Pegaso PCS; MVNO on AT&T, own spectrum returned ...

9. iPhone - Wikipedia

   en.wikipedia.org/wiki/IPhone

   SIM unlocking. Many iPhones bought through a monthly carrier contract are SIM locked, restricting their use to one particular carrier. While the iPhone was initially sold in the U.S. only on the AT&T network with a SIM lock in place, various hackers found methods to bypass that SIM lock.