I have a Verizon 4S. I'm leaving for a year abroad in France in a few weeks, and I bought a prepaid/pay-as-you-go SIM card (here) from the student travel agency I bought my flight from. One of the things that has me concerned is using iMessage. The majority of the people I text the most have iPhones, and thus, iMessage. With this SIM, I'll be paying per message. Will I be charged for using iMessage? Thanks!