I want to know about imessages and how it works !! how to register a number with imessages?? I saved a number in contacts but when I try to send a message it say "! not delivered" in red mark.How can I fix this problem??

I want to know about imessages and how it works !! how to register a number with imessages?? I saved a number in contacts but when I try to send a message it says "! not delivered" in red mark.How can I fix this problem??

Perhaps something in this support article will help:
http://support.apple.com/kb/TS2755
Regards.

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