My iPhone won't send or receive any text messages?

My iPhone 4 can't receive or send any texts/iMessages. When I try to send a message it doesn't show the little red 'error' circle or anything, the text will appear and it will say sending and as it's finished loading it'll just disappear. No one receives my texts and I don't get theirs. What should I do?

I have an android phone so it may be different on a.iPhone. I've fixed this before actually. I unmounted my sd card and then removed it. Did a factory reset on my phone. After it got done resetting, I put my sd card back in and re-setup my phone. After doing all this everything worked fine. But like I said I have an android phone so it may be different.

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