If I am given an Iphone and insert my at&t sim card will I have to contact AT&T or will the phone be live with my current plan? I am trying to avoid the $30 per month data charge.
AT&T will detect you're using an iPhone and tell you to upgrade, and eventually will force you to.
The iPhone will work with your sim, but you'll be found out.
If I already have the unlimited data plan does that change anything. Because right now I have a smart phone and only pay $10 for unlimited data, because of a mistake they made and I know they can not change my plan without my approval.
From what I understand, if you put your sim in an iPhone, they can change your plan. I believe they put something in writing somewhere that basically states that you understand that data is $30 for the iPhone and putting your sim in an iPhone you are agreeing to the terms.
Someone posted that here, but I can't find it. I know I'm not stating it correctly, but it was something like that.