So, I had my iPhone 4 on 4.3.3 and Baseband 4.10.1 up and running on a blank T-Mobile SIM showing T-Mobile as the carrier. Fast forward a few weeks, I've been out of town travelling and the phone has been sitting in my trunk. I pull it out today to sell to a potential buyer and the danged thing takes 5 minutes to boot...and when it does it comes up in recovery mode. I try and try several things at work to get it going but nothing works. I come home and connecting it to iTunes, seemingly it comes up and all is well...but not really. Currently it's in a mode going back and forth between a recovery mode or a partially working activated mode, but the signal never connects to T-Mobile. I can get it up and running on my working AT&T sim. What is the most stable setup for me to get this thing on to sell to a potential buyer? I'd like to be able to walk up to them, they drop a T-Mobile micro-sim in and they are off and running. Thoughts?