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Support Replacing Logic Board

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http://androidforums.com – So my power button has stopped working, rendering my e4gt near useless. Since the power button is soldered to the logic board, i figured i would try to find a used e4gt and use the logic board. I found one with a broken screen on my local craigslist for $50. My question: Will the new logic board work in my phone? Will I need to do anything else service/carrier related after replacing the logic board or will i still retain my same number? (General)