Problem with iPhone 4 sending texts?

I've been trying to text my boyfriend and the past two days the sending bar gets about 9/10 the way sent then just stops and says message failure or something like that. It's only with his phone though. I can send texts to anyone else. Any ideas? I have tried turning off my phone then back on it didn't work though. Any tips are greatly appreciated.

Sounds like a carrier issue

If it's an iMessage, turn iMessage completely off and try. If not, call your carrier because something is going on beyond your control.

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