I have a Jailbroken 3GS that I need bring into Apple Genius Bar to have the phone replaced. My phone has horrible signal, it has gotten worst and worst and now its to point where I almost NEVER have any signal in my house. I have AppleCare and want to know what are the steps I need to do to get my phone back to Original OS? I received this phone jailbroken so I never did it myself. Also any suggestions to how about going to get a Replacement phone? I dont want to travel all the way to Apple to get a run around and not walkout with a new phone. My firmware is 06.15.00 Ver 4.2.1 Thanks! Edit* whats best way to backup my phone so when I get new 3gs I can just restore what I got now?