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When you send an SMS message to a turned off iPhone then check say an hour later and the SEND button is blue, does that mean the user at some point has switched on to check messages? Cause I tried to resend as iMessage and it went green again?

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    What exactly is your question? Is your question: How can I be certain my iMessage isn't send using SMS? (I think the answer is: you can't)
    – iDeveloper
    Commented Jan 11, 2013 at 7:13
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    @iDeveloper That's not right, as you can always switch off the Send as SMS under Settings / Messages.
    – Thecafremo
    Commented Jan 11, 2013 at 7:49

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If the recipient's iMessage is unavailable, or yours, for that matter, the Send button will be turned to Green, showing that you'll send a SMS. When the iMessage service is available again, the button will be turned Blue, showing that you'll be sending iMessages instead of SMS.

So, if you want to make sure you'll always be sending an iMessage, although the service is unavailable, meaning that the recipient will receive the text whenever it's possible, just switch off the Send as SMS under Settings / Messages.

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