My iPhone 4 won't send messages to certain people?

My iPhone 4 won't send messages to one of my friends or when it does it sends a message it gives me a send failure message or if it does send it sends something that she's already received before I can send messages to everyone else in my contacts but not her

Sounds like a classic network issue… Lets try a re-registration first.

turn of the iphone… Wait 3 min… Turn on… Work now?

If not, call your wireless carrier. If your friend is on the same carrier as you, then its called intra-carrier exchange… Simple fix since its he same carrier… But… If your friend is on a different carrier than you, then its called inter-carrier exchange… Hard fix cause it could be your carrier's fault or hers carrier's fault… Just call your 611 and tech support… They will take over from there

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