Currently Being ModeratedSep 23, 2013 11:58 AM (in response to Alokke)
Welcome to the Support Communities!
The first thing I would suggest is resetting and/or restarting your iPhone.
If that does not resolve your issue, follow the steps below:
Currently Being ModeratedSep 23, 2013 12:50 PM (in response to judysings)
Cheers for the link. I was having the same problem and it was as simple as the fact that i had my date and time set manually. as soon as i switched to automatic it logged me in to imessage fine. guess i won't be able to cheat on candy crush anymore.