Thanks for the advice. I've read there hasn't been any software that resolves this issue for modem firmware 4.12.01 which is what I have. Will this still work?
It's not related to firmware version, IMO.
Here's how, read this:
Awesome! Thanks so much for filling me in. It was as easy as you said and now my phone is finally able to access the 3g network. I really appreciate your post it solved a huge problem in my life. Thank you.
Do you have to use a SIM card to unlock it? And if so can I use my AT&T one?
Yes, you will need any SIM card, if you use non-at&t use, just insert it and connect to iTunes.
If you use AT&T SIM, simply restore the iPhone through iTunes.
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