[HELP] iPhone 4 Unlocking with 5.1.1
A friend of mine who's just new to jailbreak stuff "accidentally" reseted all settings to default as using iOS 5.1.1 with unlock.
Now, she can't use her iPhone because she needs to activate with a valid SIM (this is AT&T's model). Since she upgraded without custom iOS, she probably upgraded her baseband as well, right? I'm not quite sure which baseband her iPhone has now. She hasn't jailbroken for 5.1.1 yet.
The point is: can I unlock again her iPhone 4 from scratch using 5.1.1?