My iphone won't send/receive pictures?

I have an iPhone 3, and I've always been able to send pictures to others, but now it won't let me. I can send pictures on an iMessage, but not other than that. People have been sending pictures, and I never receive them. And I take pictures on my iPod since it has the camera on the front and my phone doesn't, so I send them to myself and I havnt been able to receive any of them in about a month and a half.

If you have Cydia you need to watch this youtube video and enter the MMS details in your iphone:

http://ibuybroken.com

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