My wife and I are going overseas for a few weeks this summer. We'd both like to take our iPhones...but not to make phone calls. Mainly just to play around with any wifi we may stumble across. In order not to get stuck with a phone bill equal to a doctor's salary, I just want to confirm that this is all I need to do: 1) Turn Airplane Mode on. 2) Turn Wifi back on. 3) Turn push off. 3) Turn data roaming off. In regards to texting - can we send and receive text messages while on wifi? Will the above settings prevent us from sending and receiving texts when on Edge/3G? I really don't want to pay 50¢ per text.