Imessage for iphone still not working

I have an iphone 4 and my imessage always always always stops working!
I usually have to keep resetting network settings all the time just to get it to work again but now it's just stopped working all together! I've tried absolutely everything and checked every website for what to do but NOTHING works.
i really need help!

Go onto the apple website. And book an appointment at your local apple bar. If you can't get it to work and you say you have done everything you need to go see the geek team. They will get it working.

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