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2. 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.

3. eSIM - Wikipedia

   en.wikipedia.org/wiki/ESIM

   Phones with eSIM only do not need to be built with hardware SIM holders or means to insert them. This is particularly relevant for small devices such as smartwatches. [34] Users can update to a new plan or switch carriers instantly online. [35] eSIMs are better suited for Wi-Fi hotspots due to seamless network switching and enhanced security. [36]

4. Remote SIM provisioning - Wikipedia

   en.wikipedia.org/wiki/Remote_SIM_provisioning

   The eSIM describes the functionality in the SIM, not the physical size of the SIM - and there are eSIMs in many formats (2FF, 3FF, 4FF, MFF). GSMA have also developed a compliance framework [ 10 ] for eSIM devices, eUICCs, and subscription management products - to help with interoperability and security for products supporting eSIM.

5. SIM swap scam - Wikipedia

   en.wikipedia.org/wiki/SIM_swap_scam

   A SIM swap scam (also known as port-out scam, SIM splitting, [1] simjacking, and SIM swapping) [2] is a type of account takeover fraud that generally targets a weakness in two-factor authentication and two-step verification in which the second factor or step is a text message (SMS) or call placed to a mobile telephone.

6. Mobile number portability - Wikipedia

   en.wikipedia.org/wiki/Mobile_number_portability

   A key technical aspect of Mobile Number Portability (MNP) involves the routing of calls or mobile messages (SMS, MMS) to a number once it has been ported.Various call routing implementations exist globally, but the International and European best practice employs a central database (CDB) of ported numbers.

7. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) 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).