Wirelessly posted (htc Pocket PC: Mozilla/4.0 (compatible; MSIE 6.0; Windows CE; IEMobile 7.11) Sprint MP6950SP)
Wait. Just because it was used on Metro PCS doesn't mean it was unlocked. Metro is a CDMA carrier. OP you probably just need to flash the shipped Sprint ROM and Update Profile and PRL. You may have to reset some of the Sprint settings but it shouldn't be a big deal.
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Trombone players do it in 7 positions!
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