Hi. I want an iphone, preferably 3gs, but I will take 3g, without the outrageous minimum of $70 monthly plan from AT&T. I would like unlimited texting and data, and Voice is optional. I know I need to buy an iPhone on ebay, craiglist, etc. And I know the only two options I have are T-mobile or a non iPhone AT&T plan. My questions are these: 1. If I get a pure data plan and use skype for voice and text, will it work on T-mobile's EDGE network? And on AT&T's, is the call quality bearable? 2. Is it still possible to buy a SIM card from AT&T? And if no, can I buy a phone that has one in it, so I can transfer it with the one in the iPhone? Does this also work for T-mobile? 3. Is there a way to buy a SIM card from t-mobile without having to order the "$150 FamilyTime Unlimited with Flexpay"? (If you add a SIM card to your cart, http://u.nu/3tnk3 , then that is the only option for a plan) 4. The only pure data plan for AT&T is 5GB for $35. If I would use Skype, plus Safari, download apps, etc. would I go over this limit? I know it depends, but how much bandwidth does skype use? To sum up what I'm looking at right now: either $20 unlimited data and text T-mobile plan ( http://u.nu/2wnk3 ), or the 5GB $30 a month AT&T plan, with possibly a voice addon if 5GB is not enough for skype (which I am thinking it won't be). Thanks for any answers or recommendations!