Hi. I am a soon to be iPhone owner. I'm looking into plans. I'd like to buy a pay as you go plan but my local Apple store had no information. Could someone help me out here? Which plans will work? Will I be able to use Edge if I buy one of these plans? This iPhone is used... how will I register the plan (Can I do this in iTunes)? Do I have to go to AT&T to buy the pay as you go plan?