Here's the situation: I bought the iphone 3g in September of 08. I just recently purchased a house, so to save money, I purchased a cheap go-phone, and canceled the data plan and everything attached to the iphone. So basically, I had a basic messaging and phone plan. I was missing my iphone ALOT, and out of curiosity, I popped in my sim card into the iphone 3g, and behold, full service. I can make calls, receive calls, and use text messages. I can not access the internet, (i had it blocked so I don't incur any charges on the go-phone), or the visual voicemail, (which is fine). I can access the internet and itunes, app store, via wifi on, (which also is fine). Has anyone done this before? Will I incur any charges? Can ATT charge me for using the iphone as just a regular fancy phone? I know that GPS won't work. I know that I won't get 3g service. I know that I won't be able to access the internet, app store, and itunes. I am fine with just using the wifi when I need to. Any input would be grateful. Thanks. p.s. please don't say "why would you want an iphone if you aren't going to use it to its potential." I just miss physically having this wonderful phone with me at all times. If I can continue to use it this way, that is fine.