With AT&T, the iPhone is the only phone where you are required to get a data plan. You don't have to get an unlocked phone. Just buy any AT&T phone (with a qwerty), except for the iPhone. If you don't wish to use data, don't get the data plan. You can even block data if you wish. Reps will push the data plans, because they work on commission, but expect for the iPhone, you are not required to have data on any phone, even smartphones. You should get a text plan though, since you plan to text.