hey guys, i bought the Samsung i607 BlackJack SGH-i607 unlocked with windows mobile 5.0. I want to use it with my T-mobile service and at the same time i want to upgrade it to windows 6.0, here's my questions, if i upgrade the system, will it lock the phone? or it stays unlocked no matter how i update the system? thanks a lot for your help! i appreciate it.

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