My iPhone 4s won't send pictures?

My iPhone 4s will not send pictures to other cell phones. It sends them trough iMessage and I can receive but it will not send. It says that it sends then puts a little red exclamation mark next to the picture.
I have reset my network settings.
I have reset my phone.
I have MMS on.
I did not remove picture messaging.
My 4GS is on.
I have storage room.
I do have AT&T and this has been going on for a week now!

Try holding the power, & home button until you see the Apple icon(about 20 seconds).
Then let go, & let the phone reset, takes less than 1 minute.
If the problem persist, contact Apple, you might need to do a phone exchange…

My iPhone 4s won't send pics, it tries to then says not delivered. What can I do?

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