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Hi @Gildingsv . What is the model number of the 4G router?
Can any of your wifi devices connect?
Do you have an ethernet computer?
@Gildingsv . In the router, go to Basic, Wireless.
Disable Smart Connect if set.
Enable both networks.
Don't hide SSID.
Make the 5GHz SSID different from 2.4GHz.
Save.
Go to Advanced, Wireless, Wireless Settings.
Check that each SSID uses WPA/WPA2 Personal.
You might need to reconnect your devices.
@Gildingsv . On your phone, start the browser (Chrome or Safari).
In the address field, enter 192.168.1.1
If it asks you to set a password, make it admin just for now.
Otherwise, the password is on the label on the router.
Because the router should be partly set up by TPG, the email you received might have the password.
This should be the main menu. Continue as above.