IMessage not working for iPhone 4?

I decided to turn off my iMessage cause it was acting weird today and it doesn't wanna activate again, it says " waiting for activation " its been working fine for like months i don't know why it's doing this now, it's factory unlocked for tombile but it's been working great like it's never done this before

Its more than likely something to do with the iMessage servers, i hear complaints all the time about it not working. Just try and activate it again at a different time.

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