New Modem, SWYH Stopped Working

Restarted comp, reinstalled, still not working.

Went from 2.4ghz to 2.4ghz + 5ghz ATT.

Please help

Able to bring up URL on computer browser but not on phone

Could be that your 2 access points (2.4/5) are on different subnets. Do you connect to the same network on computer and phone?