Well I know this thread is a little outdated so I hope you're all still subscribed.
I have an iphone 3g on 2.2.1 with the new baseband (can't remember off the top of my head, but the one that came with the 2.2.1 update NOT the 3.0 update) I get the same 'carrier null/null' I restored it, and nothing happened, and then I jailbroke it and nothing happened, so i restored it again and still nothing. My question is if I take it to att with the default settings, and they can't fix it, will I get a new one? It is still under warrranty, but I don't have att. I have another iphone 3g that is unlocked that I used, but I got this one for my brother who also has tmobile. Will apple give me a new phone if it's under warranty but has no service??
Or is there a way to fix the carrier null/null. If you need a picture, I can upload one later, I'm not on my computer so I don't have the pic.
Thanks for the help!