Okay... this is kind of complicated... so hang in there for me. So I ordered a Gold iPhone 5S T-Mobile Unlocked 64GB for myself, and 1 Space Gray 32GB on an AT&T upgrade on September 20th. Got both of them today. Thing is, the wife couldn't wait for the long delivery time because she dropped her old phone in the hot tub, ironically, right after we had ordered the new one using the Apple Store app. So early that morning I went to the Apple Store at the Grove and got her a 32GB Space Gray iPhone 5S device only. To use her phone number right away, and because we wanted to leave AT&T for Straight Talk anyhow, I used an AT&T Straight Talk NanoSIM and ported her number out of AT&T and to the NanoSIM. Popped it into the new iPhone 5S, and within minutes she was using her own ported number from AT&T on the new iPhone 5S on Straight Talk AT&T with LTE. I used a T-Mobile NanoSIM and performed the SWAP TRICK method to get to the APN settings and am happy to report that MMS is also working perfectly on Straight Talk AT&T on the iPhone 5S. Of course the actual phone purchased on the subsidy just arrived. It's still in its box. I assume that this one is locked to AT&T? Now I DID by it from Apple directly but with the upgrade price, unlike the one I bought device only from the Apple Store. Can I unlock this with a third party unlocking service, or is this phone already unlocked? I'm fully aware I'll probably have to pay the $325 ETF fee, but just wondering what I should do at this point since I'd like to sell the iPhone but don't want anyone to run into any problems with activation. Any advice or comments would be appreciated, thanks!