I have an iPhone 4. I just updated my phone to the most recent iOS (7.03). My iMessage won't let me send from my phone number, and people are receiving my messages from my email. The phone number is there but is grey and won't let me select it. Why is it disabled? How do I fix this?
IOS – Why does the iMessage say I’m sending from the email instead of the phone number
apple-idiosiphonemessages
Best Answer
Assuming you did not change any other settings after the upgrade (like Restrictions), your iMessage may need to be reactivated. When you look at Settings > Messages, you would also see that it displays the message "Waiting for activation...".
There are several ways to get it activated, and sometimes it may take a few tries since Apple's servers may not respond in a timely fashion.
If the above does not work, you can also follow the steps from iOS: Troubleshooting FaceTime and iMessage activation (edited steps below):