Why won't iMessage work even when I connected to the Internet?

I have an iPhone 4 and iMessage works with ever other person that I have on my contacts with an iPhone but not with this just one person. It goes off an on but lately it's been off most of the time even though we're both connected to the Internet. Someone help

Either the problem is on their end or you have improper contact information perhaps. I would remove the contact and re-add them. Also make sure they are not blocking you on their end.

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