So here is a little background information... I got a new iPhone 3gs running ios 5.0.1 from the Apple store last week. I inserted my tmobile sim and surprisingly it recognized it without having to install ultrasn0w. I used SAMprefs to activate it and had a fully functional 3gs. I noticed a few days later that I couldnt access the internet unless I had wifi so after doing a little research I (stupidly) decided to restore the network settings straight from the device. After doing this, the iPhone rebooted and no longer recognized my tmobile sim and said "no service." Now I am unsure what to do next. The baseband is 05.16.05 and my serial number is xxx153 so I cannot change the baseband to 06.15.00. I need help unlocking my device to work on tmobile again but I do not know where to begin.