Sending someone pictures on the iPhone 4?

I have the iPhone 4 and I want to send my friend some pictures of my vacation trip. I put the pictures in the text message but when I try to send them it says, "not delivered" and has a red exclamation to the side of the pictures. How do I fix this?

You have no signal…

"sigh" ok first of all you need signal from your phone service or wi-fi. If you don't have those then thats your problem. If you do then its a network error or you have wasted all your minutes or if you have unlimited then you have to pay the phone bill.next time givie us a serious problem.okay, thanks

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