Hi! My wife and I both got new iPhone 5 on Friday. Since then we have been sending some iMassages in either way. This morning I send another one to her and it was sent as (green) SMS - for whatever reason. I had this experience when we used our iPhone 4 and the phone always switched back to the blue iMessage after one SMS - so no big deal. But this time the phone is "stuck" in the SMS mode. Anyone having the same problem?