Imessage waiting for activation?

My iphone has been stuck on waiting for activation for iMessage for some time now for some reason no matter what I do it won't connect can someone please help I'm overseas right now and really need it to work

Common problem. Hope this helps.
Best luck.
http://www.igeeksblog.com/fix-imessage-waiting-for-activation/

http://bkbeachlabs.com/blog/solved-imessage-activation-error-an-error-occurred-during-activation-try-again/

http://support.apple.com/.../kb/ts4268

Have a look at this video:

Explain in more detail please.

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