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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).
The Cellular Telecommunications & Internet Association (CTIA), lists approximately 30 facilities-based wireless service providers in the United States as members. Competitive Carriers Association (CCA) has over 100 members. [ 1 ]
Cellular Abroad is a mobile virtual network operator and internet retailer based in Los Angeles that uses GSM technology to provide international wireless voice, messaging and data services. Cellular Abroad sells and rents unlocked international GSM cell phones , portable WiFi hotspots and SIM Cards under the National Geographic Society brand.
For GSM, UMTS and LTE networks, this number was provisioned in the SIM card and for cdmaOne and CDMA2000 networks, in the phone directly or in the R-UIM card (the CDMA equivalent of the SIM card). Both cards have been superseded by the UICC. An IMSI is usually presented as a 15-digit number but can be shorter.
Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from major carriers such as AT&T Mobility, T-Mobile US, or Verizon Wireless, as well as regional carrier United States Cellular Corporation for resale. The largest operator of MVNOs is TracFone Wireless with over 25 million subscribers.
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.
In 2017, after several years of development, Keepgo patented the EzFi Virtual Sim technology (compatible with GSMA eSIM). [9] [10] In 2018, Keepgo developed a white label service to enable companies to add global cellular connectivity to their products. Keepgo service utilizes pSIM (physical SIM card).
Puerto Rico (T-Mobile US) Romania (Telekom Romania) Slovakia (Slovak Telekom) United States (T-Mobile US) United States Virgin Islands (T-Mobile US) List. GSM, GPRS ...
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related to: us cellular international sim card