sprint is using different system and it is so impossible to use sprint phone on other carrier; so, sprint system will never recognize the serial number of other carrier's phone and the other carrier's system will never recognize sprint phone; your boyfriend can get options by calling his local carrier's support hope this helps
I suppose anything is "possible" no matter how improbable. Further, I suppose we could have requested additional information about the type of spare phone, technical prowess of the parties and their willingness to deal with a dual mode international device if indeed that is what they possessed.
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