How to bypass activation screen on iphone 3gs?

So i found an iphone 3gs and i reset everything, but now i'm stuck on the activation screen and i don't know how to get past it. Please help. I don't know how to jailbreak either. What's the easiest way to unlock this phone to work with t-mobile. And how do i jailbreak?

You can't use with tmobile unless att unlocks it, or you jailbreak and install the ipad baseband then untrasnow.

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