Why won't my verizon iPhone 5 send messages to certain people?

I have a friend who has verizon and it sends messages to him very fast and I have friends who have different carriers and it won't send to them. The send bar keeps on going and stops at the last second. I have turned it off and on again and I have reset my network settings. Nothing has worked at all.

Take it to the Apple store and have them check it out. Sounds like it's a problem with the phone itself.

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