Texts not working on Iphone 4s?

I just got a new 4s and text don't seem to be being received as i have sent them from other phones to check.phone calls are working both ways and i do have signal. Any ideas is it possible that it isn't fully activated yet? And yes i'm aware that the iphone 5 comes out next month prob but i can't afford it

Go to your setting and make sure text messages is turned on.

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