Hello everyone, I have a daughter who is on my AT&T family plan but she keeps running out of minutes, buys numerous ring-tones and keeps our bill inflated. She is turning 16 and we have agreed on a compromise. I shall purchase her a phone of her choice as long as she has her own plan. She wants the iphone 3g with 16gb. An AT&T associate suggested the pay as you pick plan since she is below 18, where she has to pay for her airtime before she even uses the phone. I have a few questions which I need answered before I purchase the iphone for her. 1. If I get the I-Phone 3g for her, can she insert her new pick your plan sim card into her I-Phone when she goes to the AT&T store? 2. I am limited to purchasing a new or used phone from Ebay, which she doesn't mind, as long as it is an I-Phone. I usually see the terms 'jail-broken' and 'unlocked' for most of the I-Phones on sale, meaning that they have somehow been 'tampered' with. Will anything happen if she uses an unlocked or jailbroken I-Phone with the new AT&T simcard? 3. Can she have unlimited internet use using the I-Phone, since she is bound to surf the internet like crazy. Does her plan allow her to have unlimited internet access? Is Wifi free when using the I-Phone, so that she can limit her usage so as not to inflate her bill? 4. If I get her an i-phone, can I simply insert the sim card into the i-phone 3g and it will work seamlessly? Since the phone may be 'used' or refurbished, does it need to be activated again, and shall it function just like an ordinary i-phone with a contract with AT&T? 5. If you have done this kind of thing before, do you mind posting the steps I need to take to activate the sim card so as to use the i-phone? Could I put the sim card on the i-phone? Sorry if I asked a question that was already in this forum, but I searched and did not find anything specific to my above questions. Thanks for your input. Have a nice day everyone.