I have a friend who uses an Android mobile phone and also a Mac. My iPhone contact page for him shows a FaceTime icon which I suppose is correct because it would go to the Mac when available but if I choose the speech bubble next to his phone number my iPhone goes to Messages and shows "iMessage" in the empty box. There's no speech bubble next to his email.
The messages that I send him are delivered succesfully via iMessage (blue bg) but how can I explicitly send him a regular text (sms) message to make sure that it's delivered to the Android phone and not to the Mac? I'm using iOS 9.3
Please note that I don't want to disable iMessage altogether.