I m having trouble with getting multi media messages on my Windows phone?

okay, so I have been unable to send or receive pictures, audio, and video. I have no idea why this is and I would love to have it fixed asap.

I have it hooked up with Virgin Mobile.
I have the WiFi lovers plan, which includes 300(or 200 i can t remember) minutes of talk time, unlimited texts and no data.
It s a Nokia Lumia Windows 8 phone.

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