Hi all Tried to do a search but couldn't find the answer. Does anyone else have the problem on the iPhone 4S when you try send a sms sometimes it does not send, and you have to try and re-send the sms. I find that sometimes to resolve the issue. I have to switch 3g off and on or switch air plane mode on and off to resolve issue. This has happened on 2 iPhone 4s I have owned.