Ok, here's my problem. I'm an American student studying in France for this entire year. I have a 4S from Verizon, and I had it unlocked for international use by Verizon/Apple. When I got to France, I went to an Orange store and bought a Mobicarte (prepaid sim card). For some reason, even when I'm on wifi, my iMessage doesn't work. Anyone experienced this while in France or have a solution? Merci beaucoup!