the sony brand has yet to make a cdma phone as far as i know
the p800 is a gsm phone
gsm phones can be ulocked to use sim cards from different carriers
sprint and verizon are cdma networks so their phones are locked permently to their network at the carrier not at the phone as the carrier has a database of esn's (serial number like things on yourphone) hat define which phones they support
so to use aphone on sprint you need to buy a sprint branded phone

sorry

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