Here's my scenario. I just bought two 8700s from Amazon for T-Mobile. I should've waitied because now, I want an 8100. But that's ok, because here's what I want to do...I was thinking about returning my 8700 (I have 30 days) but first, go to the store and buying/adding an 8100 to my account for an "additional" line. Once I get the 8100, just send back my 8700. Anyone see any issues with this or think it won't work? I apologize if this seems like a stupid question, but my old service was Sprint/Nextel, and I don't really have much experience with T-mo Thanks everyone for your help in advance!