Unlocked Cell Phones are a cell phone that can used differant GSM compatible providers (carriers) worldwide.GSM cellular
phones requires a SIM card to operate. That means an unlocked cellphone can be used within USA with At&T,Sprint,Verizon
wireless,T-Mobile,Alltel, and more.The frequencies of the phone needs to be supported by the service provider.
Unlocked cell phones can also be used with many other GSM service providers/carriers around the world. Many manufacturers
offer unlocked GSM cell phones.
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