Imessage issue/bubble problem?

I'm texting somebody who lives in Ohio, but I live in California. We both have IPhone that have Imessage installed and for some weird reason when we text each other the chat bubbles show up green instead of blue. Also whenever I try to send her a picture message it always bring me an "error can't be delivered" message and I have no clue why this is happening! How do I fix this?

Make sure that your settings are set to 'iMessage' on (green showing) in your Message Settings menu. Sometimes when I iMessage people, it'll send them as normal green texts too. Has something to do with the network signals.

IMessage can work off of email address and/or telephone number. If the number isn't associated with iMessage it might not deliver. You and friend need to confirm settings here:

http://support.apple.com/.../kb/HT5538

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