Why won't my iPhone 4s let me send picture messages?

It gives me the option to send pictures and will let me choose a photo but when i press sent the little bar at the top fills half way then stops and a little red exclamation mark comes up next to the picture saying not delivered. Is there something wrong with the phone or can a change it my self in the settings?

My guess is the settings, phone your network provider and there be able to help you with the settings.

hope this helps

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