Im having a problem sending text messages to Verizon customers. Some of my messages are not being received. I have an Iphone 3gs, I never had this problem before I got an Iphone. I called AT&T and was told no problems could be found. They told me to call Apple, I exchanged my phone for new one, same problem. Now AT&T is telling me to contact Verizon. It's all very frustrating and I don't know what to do. Anyone else having a problem with some of your text messages not being recieved by Verizon users?