My brand new iPhone 4 won't send OR receive picture text messages?

Okay. So recently I got a brand new iPhone 4. Everything works perfectly and I can send and receive texts, but I can't send or receive pictures in texts. Yesterday I could send pictures to one of my contacts but I tried it again a few hours later and it didn't work. I'm so confused.

MMS IS TURNED ON So Please DO NOT TELL ME TO TURN IT ON BECAUSE IT IS TURNED ON. I HAVE A PLAN THAT IS UNLIMITED TXT MESSAGING WHICH INCLUDES UNLIMITED PICTURE/VIDEO MESSAGING.

Should I restore it to it's factory settings? (I don't really want to as I have 200 + photos and lots of apps already which I don't want to get rid of, but is there any way to save the photos so I can like, sync them to my phone if I do end up having to restore?)

Should I call customer service?

Please Help. I tried restoring my network settings but that didn't work either. I'm really frustrated.

Call your service provider. It probably has something to do with your data plan!

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