Why can't I send picture messages with my iPhone to other phones?

I can only send picture messages to other people with iPhones but not to anyone that has any other type of phone. I have the 4S and I have my MMS/SMS switch on. What's the problem?

I have that same problem but when I turn on "Cellular Data" on, I can receive/send pictures. It sucks cause I have to pay whenever I turn Cellular Data so I downloaded Pinger & send picture messages from there.

It's your phone plan. You don't have picture messaging. Sending a text or picture to another iPhone is sent as a iMessage which is free, I believe.
I don't think having a 'switch' on means nothing, if it's not in your plan.

I have I6 and I have everything in my plan but I still can't send pictures to any phone out her then a iPhone

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