IPhone is not sending pictures?

Okay so I have an iPhone 4, and the other day I was trying to send my friend a picture and it just would not send. I can receive pictures I just can't can't send them. When I try to send a picture it says "delivered" but then 3 seconds later, it says not delivered. I know it's not my Wi-Fi because I tried at like 3 different places, and it not my phones internet because it wasn't sending using cellular data.

Make sure SSM and MMS is turned on in your settings-messages. If it is still not sending photos it would be best to contact your carrier as there might be an issue with your carrier settings.

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