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Quoted from Grinder901:Iām going to ask him today which provider he has.
So it does matter or can the sim card just be switched out?
Yes, there are two types of cellular networks that are used in the US, GSM and CDMA. GSM is used by AT&T and T-Mobile, CDMA is used by Sprint and Verizon. If you buy a used CDMA phone you can only activate it on a CDMA network, same for GSM.
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