I'm using ismartphone SIM unlocker on a 3G running 2.1 software/baseband. My iPhone will work for about 4 hours then go to "No Service". Then I have to put my SIM into a Tmobile phone and then switch it back to my iPhone and it will work unlocked for another 4 hours until it goes to "No Service" again. Rebooting, airplane mode - nothing works to fix it except putting it into my Tmobile phone and making a call then switching back to my iPhone. I have the latest and greatest ismartphone SIM unlocker too with the new programming.
Anyone else had this issue with T-Mobile, and/or know how to fix it?