What can i do if my Iphone 3gs won't send text mesages anymore?

My phone is a hand me down and i put my old sim in and it was doing fine for about 1 month when all of a sudden it won't send SMS anymore. I haven't upgraded it or installed any thing. I've tried alot of methods but all failed.

I would buy a new one or if you are younger ask your parents what is wrong with it

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