My iPhone 4 isn't connecting to my Wi-Fi?

I went for a holiday and when i came back home i tired to connect my iPhone to my Wi-Fi And it said no Wi-Fi after that it work one time for about seconds and went off

If it's saying that the connection isn't available I had the same problem the other day and I spent 3 hours on the phone with Verizon if you stand right next to it and it recognizes it than you need a "power booster" for the router from like walmart or best buy if not than try shutting the router an phone on and off and all that stuff and if it still doesn't work reset the network settings on your phone and if it STILL doesn't work you probably need a new modem. Also just make sure the Wi-Fi is on, on your phone and router.

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