IPhone 3gs won't send pictures? - 1

Okay, got the iPhone 3gs yesterday from game stop.

I can't send pictures? I have MMS Messaging turned on. Anything else I need?
I hate having to ask, but after looking around I haven't found an answer.
I will not 'jailbreak' my phone, so if i have to jailbreak it or whatever, I won't.
What should I do? I'm pretty sure it'll be simple.xD
Thanks<3

Added (1). I do have Data and a supporting plan or whatever, I believe.

You need Wi-Fi/data and your phone plan has to support it

I'm having same problem, mms is on, Wi-Fi is on anything else?
My husband has the same, phone, Wi-Fi and plan and his will send?

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