Why can i send pictures on my iphone 4s?

So i have an iphone 4s which used to be verizon but i unlocked it and now i have tmobile as my current service. I can recive pictures but i can't send them? I think i have to put in new codes or something not really sure. Please help it would be amazing

p.s. My phone is running ios6

Maybe your text message boxes are over stuffed. Try emptying out unneeded messages and save large attachments elsewhere.

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