I have an iphone in the UK on pay as you go, and I am in the US right now. The place I am at has wifi, but I don't know if I can send text messages to people back in the UK without it costing a lot more. I have roaming turned off on the iphone. Can anyone please advise whether sending text messages in my situation is possible or more expensive than normal? I don't want to try it and find out that I have been charged 10 or 20 pounds for it like my friend discovered when she answered an email while on vacation.