Iphone 5c imessage was working, now it's not?

My iphone 5c is in the newly updated ios7 format, and imessage was working perfectly earlier in the day. It's connected to Wi-Fi, my data is on, and every other required thing is enabled, but for whatever reason, it currently isn't working. Now when I try to send a message, a notification pops up that says "Can't Send Message. IMessage needs to be enabled to send this message." I go to my settings, messages, and see that imessage is enabled but says that activation is required? It was working perfectly earlier! I'm getting really frustrated and need help.

Sign out from your apple id and sign in again!

  • Why is my iPhone 5 imessage not working all of a sudden? This has never happened before. It was working fine all day up until about an hour or so ago. I tried restarting and all of the "fixes" but nothing worked… Help!
  • My iMessage is not working on my Iphone 4 I got the iPhone 4 around 3weeks ago.iMessage was working just fine until today. My texts were not sending at all. I have no idea how to fix this. I tried restarting my phone and resetting it and it didn't help. Someone please help! Thank you! I have tried everything! It is working on my friend's phone though so why not mine?
  • IPhone push/imessage not working? Been having problems with my iPhone for about an hour, all of a sudden iMessage's have stopped sending and I'm unable to get any push notifications (twitter, facebook, etc) are coming through. I've reset the phone numerous times to no avail. Any ideas what else I can do? I've checked notifications in settings and their all on. It's happened before but it hasn't stopped my iMessage working too.
  • Iphone airplane mode ON, Wi-Fi enabled, iMessage not working? I'm abroad and I have airplane mode on and the Wi-Fi enabled and am connected but whenever i try to send an iMessage it goes green and won't work. I checked and everyone said iMessage will work over just Wi-Fi but how do i do it?