Why can't I activate iMessage on my iPhone 4S?

I went to jamaica and used iMessaging when i was there with Wi-Fi. And now that I'm back in new york the iMessaging won't work or activate. What do i do? Every time i turn it back on and re-enter my password it says that an error occurred and to please try again. I've restarted my phone multiple times and did a hard reset, nothing works.

Ugh I have the same exact problem except I didn't go to Jamaica haha

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