Why 5ghz dualband wifi not showing in our some devices like Galaxy S7 edge even these devices have 5ghz recieving capability in specs and am trying this using linksys wifi router ac dualband?
Does your 5 GHz SSID have a different name from the 2.4 GHz SSID? Make sure they're different.
I had nothing but problems using WiFi calling and Video calling using the 5ghz Wifi. Went back to 2.4 everything works fine again.
Are you near the router? 5 GHz gives higher maximum throughput, but lower range compared with 2.4 GHz. If you're relatively far from the router, the signal might not be strong enough.
Rebooted the router (by unplugging its power for 10 seconds)?
You mentioned that 5 GHz isn't working on "some devices" -- does this mean that you've tested it out on another device besides this S7 edge?
Are these Samsung devices able to connect to 5 GHz on other routers without difficulty?
Hmm, strange. I wonder if it's a firmware issue that's specific to Samsung. Have you already Safe Mode, or wiping the cache partition?