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I have a HTC HD2 and i want to use it with straight talk. T-mobile doesn't offer coverage where I live but I have sim cards from the bring your own phone option with straight talk. However I can't use either the at&t sim nor the Verizon sim. How do I make it possible to use one of them?
Request an unlock of your phone. When granted you can use it on AT&T but not Verizon as they use different t technology.