Why wont my iphone4 to my home network and my router is fine

my iphone4 wont join my home network. it was connected to it before.I have my laptop connected to my network and my apple TV and PlayStation I also have 2 other phones to are connected to it to. I reset all my settings and all so my router.

I doubt that it was due to any Apple update. Note that this router problem does not affect any device which is already connected to the router. They have an IP address and still work. Mobile devices which disconnect and re-connect to your network frequently are much more likely to first see this problem.

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