Ok, so I'm relatively new to the iPhone realm, and I wanted to ask you guys a couple of questions. Recently we switched over to AT&T, but with a very basic plan (no internet, txt, anything special outside of making calls) and regular cell phones. I'm curious if there's a way to take that SIM card out, find either a new or old iPhone (don't really care too much about 3G), pop the sim card in and get it to work. Also, would I still be able to access the mobile network for internet and email, or would that only work if there's wifi around? Thanks.