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Essential Phone Unlocked Best Buy. The GSM (Global System for Mobile Communications) is used throughout the world, including the United States. Can You Unlock A Lost Iphone. Major carriers on the GSM network include AT&T and T-Mobile. The main distinction between the GSM network and other networks (such as CDMA and iDEN networks) is that phones sold on the GSM network are compatible with all GSM service providers. This means that you could use an AT&T phone with T-Mobile service; this is possible because phones sold on the GSM network have small chip cards inside them called SIM cards, which make swapping service providers simple.
SIM cards are small chip cards that serve two major purposes. The first purpose is to store your phone number, contacts list, text messages and emails. The second is to send communications between your phone and the service provider on which it operates. All phones on the GSM network use SIM cards, making the phones interchangeable with different service providers. How To Unlock Iphone 6 With Code. Net10 phones also use SIM cards.