Fix error in iMessage system. Anyone can help me?

Hello my friends,
My iPhone 4s don't send messages using the iMessage system in Wi-fi connection. How can I fix this error??
Before, the iMessage is available, but when I sent the message, the message be in green color.
Now, the blue color never available even using the Wi-fi network.
Thanks for support.

Is iMessage turned on? Settings > Messages > iMessage > ON
Is the recipient using a device that supports iMessage?

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Have you tried google for this Error Message...
http://support.microsoft.com/kb/959077

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Anyone have any idea wat's went wrong? Please advice .......& Thanks alot for yr help
Regards,
huiqin

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}~Bill

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Fix error in iMessage system. Anyone can help me?

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