When I send a message to the same iPhone user in the UK, sometimes it sends an iMessage and sometimes it sends it as a text.  Anyone know why?

It always seems to happen after the fact, also.  I'll check it later and it shows up green instead of blue.  And, it doesn't seem to matter if I'm connected to wifi or not.  What can I do to make sure they are all iMessages?  Or at least so I can make the decision not to send?

I believe that if you turn off "Send As SMS: off in the settings, it should only attempt to send as an iMessage and should fail if iMessage is unavailable. It tries to send an iMessage a few times and then if unable, it will send as an SMS if you have that turned on.

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