IPhone 4s Not connecting to wifi at home
Ok, seems your router works fine - this is good. Now can you, pls, check your iPhone settings for your home wi-fi network?

On your iPhone go to Settings -> Wi-Fi -> Click circled (i) against your home network name and make sure that you have 'DHCP' selected (not BootP or Static). Then scroll down to reveal “Renew Lease” and tap on it, confirm to renew the lease when asked.

Also check that 'HTTP Proxy' below is set to Off.