Thanks Kiran for the reply.
I acutally used blacksnOw to unlock several times without restoring the phone. However, it says NoService all the time. When I took it to the repair guy, he tried to restore. During the restore process he put his ATT sim during the activation SIM. The phone did not recognize his ATT sim. So, May be because of activation process did not happen, is it saying no service?

That is the reason, I would like to use the Activated Custom Firmware above to avoid ATT sim activation step during the restor. Is my understanding right? Can I go ahead and restore and use blacksnow as suggested?

Thanks much for your help.

Dear All:
Need your help. I bouth an iphone 3g 3.1.2 bb 5.11.07. The guy who sold to me told, that the phone is unlocked, however when I put the TM sim, it says no service. I took the phone to several places to unlock it once again, however the phone does not recognize and activate with ATT sim while restore process using iTunes.

Based on my firmware and version, can I use the above activated files and use blackra1n and snow to unlock the phone to work with t-mobile? Right now the phone is jail broken, since blackra1n RC3 needs fresh install, I would like to restore once again using the above activated files.

Please suggest whether I can unlock 3G 3.1.2 WITH bb 5.11.07 using the above process? PLEASE SUGGEST. Much appreciated your help.