Re: <SPRINT> SIM Card question
You do not need to unlock your phone. Sprint is Sim-unlocked. meaning any sim will work with the phone. Sprint is Radio Locked to restrict use of the US based GSM towers. Since you are going to Japan then you can pick up a card there or use the Sprint service... You only need to Sim-unlock the Sprint phone if you want to unlock the radio for use on the US based GSM towers with a US GSM carrier.
Hope this sheds some light.
James
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