Why can't I send pictures on my iPhone when it's NOT on iMessage?

I have an iPhone 4 and it sends text messages perfectly fine. It sends pictures only on iMessage! Why won't it let me send pictures when it's just a regular text message (aka when the conversation boxes are green). Not all of my friends have iPhones so I can't send pics through iMessage to them, why won't my pictures go through? It will just say "did not send" or something like that.

I had the same problem! It's because I didn't have a data plan so I turned off my 3G! If it's on you can send pics through normal text.

I had the same problem and it turned out to be my phone operator, O2 in the UK in my instance.

After contacting them I was told to try various settings including resetting my network settings (on your iPhone go to Settings --> General --> Reset --> Reset Network Settings). Nothing worked.

In the end I went into a local O2 store and they had the SMS service deactivated and then reactivated again. Now my iPhone works fine.

Hope this helps.

It's probably because your plan does not support MMS.

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