Can you connect your phone to that wifi? It usually says "Secured ...". That "disabled secured" seems to say that the router has something disabled. Connect to the router with a computer and see if anything in the wifi (or wireless) section is disabled that shouldn't be. (Check the manual - if you don't have it, you should be able to find it online - most manufacturers keep manuals for their routers on line going back about 15 years or more.)
Try to connect his phone to a public wifi hotspot (McDonald's, Starbucks, a mall that says it has wifi). Try one that's open, not one that's secured (has a little lock on the symbol). What happens with that will help diagnose the problem. (It probably will connect, even if public hotspots are a bit slow. That would point back to the first thing - a problem with the way the router is set up.)