Hi I've just got a new iPhone 4s - very exciting! I had to change my number in the process and I've just texted all my contacts as a group SMS to let them know the new number. I know that some people at least received the message OK as they have replied, however there is an exclamation mark next to the message that says 'your message was not sent. Tap try again to send this message'. Does anyone know if pressing 'try again' will resend to all or only those that failed (assuming this is what's happened)? I really want to avoid spamming my friends if I can help it!!