I have sent an iMessage text to UK and it shows iMessage format but it sends as a normal text message resulting in me having to pay extant overseas text cost. Why does this happen when we are both on IOS5.
9:16 am 10/07/12
In my experience, iMessage trys for a while and if it fails the message sent by SMS. You know because instead of the blue bubble having "Delivered" below it, it turns into a green SMS bubble. It can take minutes for it to time out, until it has "Delivered"under it, it's not an iMessage.
For iMessage to work, you both have to have iMessage turned on, and have to have working data connections. It's tricky to troubleshoot, I've had iMessages fail at home when we're both connected to the same wifi network.
To find the issue you need to know which end the failure is occurring. Can you both send and receive iMessages with other people?
Ultimately, the only things you can actually do are try turning data connections and iMessage off and on, in an attempt to fix it.
9:58 pm 10/07/12
Thanks for that. At least it's good to know someone else has the same problem.