Green button on iPhone 4 text message between iPhones?

I want to send my friend a text message. We both have the iPhone 4 and when I went to go send the text message, instead of there being a blue button, the button was green. Does that mean their phone is off?

Maybe they don't have the iMessages turned on in their settings

No, they could be out of Wi-Fi or 3g service range.happens a lot and sends the imessage as a text instead.

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