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GO to settings/messages and turn off iMessages for a few minutes or so. Then turn it back on to re-register with Apple servers.
You are not connected to Apple servers. If you have imessages setup and still comes out green that what it means. To test it turn off send as SMS in the option. Then try sending. If it doesn't send it means there is a problem. You may need to do a reset network connection. You will have to setup facetime and imessages again I believe when you do.