Why can't I send picture messages to people who don't have iphones?

I have an iPhone 4 and whenever I try to send pics to ppl who don't have an iphone, it fails. I have data on, 3G on SMS on and MMS messaging on and they still don't send. The pictures are also not in HDR when I take them. Is it because some people who I'm sending them to don't have smartphones? I have everything on that's supposed to be on so I don't understand why they won't send.

You can't thats all

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