Can't send pictures to non iPhone users

I recently got the iPhone 4. I have AT&T gophone (prepaid). For some reason I can't send picture messages to anyone unless they have iMessage. Does anyone have a solution as to how I can send picture messages to other people who don't have iMessage?
I don't have Internet on my iPhone but I use Wi-Fi.

Try emailing the pics?

It shouldnt be a problem. It should send as a text message. You not has MMS on your cell plan?

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