First off, I have 3.9bl so dont even bring up "you shouldnt have use ziphone." Anyway, a few weeks ago I unlocked my phone because I still have service with Tmobile. I basically just wanted to check it out, wasnt planning on staying with them. I restored my phone and went back with ATT. Tonight, out of curiosity, I pulled out my ATT sim and put in my Tmo sim, and surprisingly I got service. I thought a restore after using ziphone actually restored it to a locked condition?