So, my 3GS is acting weird - sporadically failing to send text messages, failing to make outgoing calls, incoming callers cannot hear me. It started last weekend and a friend told me lots of people she knew with AT&T were having problems, so I thought it had cleared itself up, but it just happened again so I think it's likely a phone issue and not a carrier issue. I haven't tried to restore it at this point (can't do it until I get home), but I'm planning for the worst case scenario and wondering what my options are. It's out of warranty but I know there's a possibility Apple will give me the $200 "fix." I believe I could also buy a 4 and then, if I choose, return it within 30 days and get a 5 (assuming it comes out), right? Could I also return my $200 replacement within 30 days? And what happens if I want to choose that option but the 3GS is no longer available at my store? If I choose to do neither, go back to my old Nokia and wait for the 5 to come out, will I be able to keep my unlimited data plan?