IPhone 4 stopped receiving texts?

I live in the UK and am on O2. I have had my phone since August 2010, and I have never had a problem until now. A few weeks ago at work my colleague dropped my phone and it got a crack on the back, although this is no big deal I'm unsure whether this could be the reason for it playing up now.
I have not received any texts since 5pm UK time, and it is now 10am. I know for a fact my boyfriend has sent me several texts as he called me to make sure I was okay since I hadn't been replying. I have tried turning my phone off and on, restoring it and also restarting messages.

If anyone has any advice I would be grateful!

Contact to your service provider.

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