My iphone 5 is not receiving messages?

I found out that when I go to settings then on to messages that iMessage needs to be activated which is strange because I've used it on my iphone which I've had for nearly a year so I put my Apple ID in then it works for a bit then just goes off again. Help me please is it my phone or my provider?

Check oogle

If it's just iMessages you're having trouble with then it's not anything to do with your provider.iMessage works via Wi-Fi, all you need is an Apple ID, not a SIM card. You could have an iPod & be able to use iMessage.
Anyway, the problem you're having could be due to the software upgrade (assuming you've upgraded to ios7). Lots of people have had problems with iMessage since the upgrade, hopefully another upgrade will be released with a bug fix for this issue.
Check out the apple support pages- you'll find forums with people who've had the same problem & some possible solutions- they're all worth a try

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