[sine90]

I have AT&T service right now on a Razer phone, nothing special just a phone with NO internet data or anything else.

I would like to have an iphone but the unlimited data is to expensive for me, plans looked absurd. I also do not need data service it as I will be in a area with wifi 24/7.

My question:

Can I buy an iphone WITHOUT a contract, unlock it, and put my AT&T SIM card from my old phone in it and just use it as a phone (and wifi)??
If I accidentally was out of a wifi zone and used internet through AT&T would I risk having a large data bill? I would honestly never need to use AT&T data service. I hope it would notify me if I accidentally did this.

I've been looking for a solid answer to this and I cant find it. Would I even need to unlock it? I see all these different versions 1.1.2 ....what not and its really confusing.

Sorry if my question is confusing! I know it is annoying to have lots of beginners asking questions but I would really appreciate it if you knowledgeable ones would help me out.