Hey all, I know this is a stupid question and I have tried doing some research but i am a bit confused. I have AT&T and never jailbroken my 3GS iPhone. I hate the limitations that AT&T and Apple place on me and would like to open it up just for tethering. I know AT&T is supposed to release it but I don't want to pay extra for something I won't use much - just out on the road. Can I use Spirit or Blackra1n and still use AT&T? What is the safest way to go about it and should I worry that the phone might go to crap? Thanks for the help.