Why can't i receive or send pictures on my iphone 4?

I can send and receive regular text messages, but not text messages with pics and videos! Annoying! Please help me. Full stars rewarded if you provide a thorough explanation on this and how to fix it!

Added (1). I have Verizon and it says mms is on

Added (2). And my dads phone, different type of phone, but same plan lets him send and receive pics.

What carrier are you on?
is Settings > Mesages > MMS Messaging > On

does your plan support it?
are your APN's correct
your question lacks a lot information i need to help you

For cost effective way of sms messaging you can try Virtual SIM.

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