My iPhone will usually connect to my wireless internet?

My iPhone will connect to my Wi-Fi network but usually I have to restart the router due to the router slowing down. This afternoon I reset my router and then my iPhone (6S) could no longer find my network, even though my computer told my that I had internet access with my connection. I've tried to go in and manually "enter" my Wi-Fi network but my iPhone keeps telling me that it can't find my network. I've tried restarting my iPhone several times but haven't had success.

Can any other wireless devices see the router? Can your iPhone see any other Wi-Fi networks? Hopefully after that you can find where the fault is