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2. SIM lock - Wikipedia

   en.wikipedia.org/wiki/SIM_lock

   SIM locking curbs this by prohibiting change of network (using a new SIM). In some countries, SIM locking is very common if subsidized phones are sold with prepaid contracts. It is important to note, however, that the technology associated with the phone must be compatible with the technology being used by the network carrier.

3. US Mobile - Wikipedia

   en.wikipedia.org/wiki/US_Mobile

   Based in New York, New York, US Mobile was founded in 2015 by CEO Ahmed Khattak as a GSM-based service provider. [7] Khattak was born in Pakistan in 1986. [8] In late 2016, US Mobile had reported roughly 20,000 customers. By 2018, the company's customer base had reached 50,000. [9] In 2020, the company claimed about 250,000 customers. [10]

4. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   A typical SIM card (mini-SIM with micro-SIM cutout) 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 devices (such as mobile phones and laptops).

5. Over-the-air update - Wikipedia

   en.wikipedia.org/wiki/Over-the-air_update

   The alternative to OTA bootstrapping is SIM bootstrapping, where the phone reads the network settings stored on a SIM card. SIM bootstrapping has limitations: settings stored on a SIM card may become stale between the time the SIM is manufactured and the time it is used; also, some phones (and other cellular client equipment) do not use SIM cards.

6. 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.

7. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!