Why won't my new iphone 4s send pictures?

I just got my iphone 4s and it won't let me send pictures to anyone without an iphone/imessage. I tried restarting my phone, i made sure the MMS setting is on my phone and i even tried reseting network settings and nothing worked. I know for a fact my plan lets me send pictures too.
Do you no how to fix this?

Try your facebook

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