How to send a picture on iphone 4?

How do you send an picture message on an iphone 4 to another persons phone that doesn't have an iphone? I have enabled the mms button, i have tried with imessage on and off, i have tried with Wi-Fi on and off. I have tried cellular data on and off.

The lowest common denominator is e-mail. Just attach your photo to a short e-mail. If they have a computer, they can view it on that as well.