Help!!!!!!!!!!!!

[olivermel]

please anyone, i've been trying to unlock my iphone 3g forever now, cos i need to change to another carrier (i use at&t), i have a version 4.1 (8B117)
model MB489LL
and the operating system for my laptop is windows vista
and i use the itunes 10 which i have been trying to downgrade for ages to no avail also(by the way can't i jailbreak on itunes10?)
please anyone help me out
i don't know so much about the techno stuff,
thanks people

[i.Annie]

Can't unlock if your baseband is 5.14.02. Check what it is in settings.

Unless you preserved your baseband when you went up to 4.1, you probably updated your baseband and now you can't unlock.