My iphone 4s won't send iMessage to one person?

I'm trying to text someone, and it won't send the message. It doesn't say delivered underneath it or anything. My messages send to everyone but this one person. Why!

Because that one person has you blocked on his/her phone. Go to settings --> Phone ---> Block and see for yourself how its done.

The other person probably has slow Internet.

Tap Settings > Messages and turn off iMessage. Tap Settings > FaceTime and turn off FaceTime.

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