Not able to send messages on my iphone 4?

It only lets me send messages to some of my contacts, including the messages on imessage. I'm updates with the ios and i do have credit. I do receive all text messages and i've tried to switch my phone off and on. Any help please?

I've had that problem. It's just a problem with your service. They are probably doing maintenance on some of the towers in your area. The problem should fix itself soon. If not call apple.

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