I have tmobile internet but it does not cover my entire house- is there an extender of sorts I can add to cover all rooms?
There are many. Also, if you had a wireless router, you can connect your T-Mobile Home Internet device to a standard WiFi router, much like a Cable / DSL modem.
I have plugged these for testing into a Netgear WiFi modem, which also has ethernet over Powerline extenders (with their own WiFi at the other ends).
https://www.t-mobile.com/home-internet/what-is-mesh-wifi
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