Hmm, that's really strange and definitely no good. Do you get a specific error message when you try? Have you tested multiple numbers to make sure it's not just happening with one number? If by chance the message is really long, I suggest sending a shorter message to see if that goes through. Longer message should convert to a picture message depending on the length so if you're also having trouble with data, that could be why longer messages don't go through. Either way, keep us posted so we can help solve this mystery.