I have recently purchased an iPad 2 and upgraded it to iOS 6. I am having trouble in setting up iMessage on it. It will ask me to sign in first and prompt me to send a message from this address. I need to click the ‘Next’ button afterwards and it will say verifying the account. After that, it will show the same sign in page. The same cycle repeats if I try again. In what way can I get rid of this endless loop?