My Iphone isn't recognizing the sim card?

Okay so my Iphone 4 is no longer recognizing the sim card. I've already tried turning the Iphone off and on, but that didn't help, nor did taking out and cleaning the sim card then putting it back in… Earlier tonight my phone was slid across the floor and hit the edge of the slate tiles, and not long after that is when it started playing up. If this is the course, can I somehow fix it?

Did you try putting the sim card different ways?

Back up your phone and restore it to default once it's at default put the SIM card in and by in I mean put it in and use something to push the sim the rest if the way so you can hear the "click" it should work

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