I dropped my iPhone 4 and now it says there's no sim installed?

I dropped my phone this morning on the tiles, as soon as I picked it up it said there was no SIM card installed? Even though the SIM card was still in there. It had a case on it and everything so I don't know what's wrong with it. I've taken the SIM card out and put it back in a few times and turned the phone on and off, but nothing works.

Could you maybe tell me what's wrong with it? Is there a simple way to get it working again? Or will I need to pay to get it fixed at the phone shop?

Hmm… I'd suggest taking the iPhone to the nearest Apple store or specialist and see what they say? It sounds like the sim card connection may be at fault. You could try the sim in another phone to see if it works to determine whether it's the sim or the phone that is at fault.