Hello there M.air.21,
I think I have the perfect article for you. It's named iOS: Troubleshooting FaceTime and iMessage activation and can be found here http://support.apple.com/kb/ts4268. It should help you resolve any issues with getting FaceTime and iMessage activated.
All the very best,
Thank you for using the Apple Support Community. Due to the nature of your issue or question you may find more information by using another one of Apple's support resources - https://expresslane.apple.com/GetproductgroupList.action