How to keep iPhone from sending iMessage text?

I have an iphone 4s with the newest ios 7. I had a contact that had an iphone as well. Now, he doesn't have an iphone he switched to a galaxy s 4. So when I receive his text its a regular text. When I try to reply it still sends as imessage and says 'delivered'. I've tried holding on the message hoping for the 'send as text' option to pop up but nothing. I've deleted the contact and then added him again but still sends text via imessage. Tried resetting phone and nothing as well. Tried changing his number from 'mobile' to 'iphone' and back to 'mobile' and nothing. Any help would be appreciated. (apple makes everything difficult)

Actually its not Apple's fault. It his fault for not properly disabling it when he switched. My friend had an iPhone & of course iMessage enabled as well & then sold it to help pay off for somethings & made sure to disable it before hand, therefore me with my iPhone still was able to text him no problem until he got back one again.

So unfortunately unless he could get that done somehow the phone will correctly send it as an iMessage.

Oh & switching from mobile to iPhone & vice versa wouldn't have done anything anyway since those are simply labels.

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