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GSM phones require a small electronic chip, called a SIM card, to be inserted into a slot in the handset. This international SIM card is the "heart" of your phone - it contains your cell phone number, your phone book, and all of your registration information. Most companies with GSM service provide you access to over 320 GSM networks in over 140 countries.
What are Unlocked GSM Phones?
Unlocked GSM phones are either (a) phones which are directly from the manufacturer which were locked, or (b) phones from a carrier which have been modified to openly work on any network.
