Ethernet

@meatloaf you will need to add a separate 2.4Ghz band to your gateway. Printers and most smart devices connect via 2.4Ghz Wi-Fi. Use your T-Mobile Internet app, tap the “Network” link at the bottom of the screen. Then + add a 2.4Ghz Wi-Fi SSID, and make sure to use “WAP” as a security protocol. 

I hope this helps.