Connecting T-Mobile home internet and my wifi mesh mesh network

I can find no documentation about the gateway network capabilities, or compatibilities. Maybe it's for a future product introduction. My only solution has been to plug my current WiFi network into the TM gateway. I can't find a discernible difference between my network, and the TM gateway network speeds. They are both at 50-70 Mb/s during the most of the day (I had cable internet and was able to get over 120 Mb/s but it was $90.mo). The weird thin is that my 5G phone can get 147-190 Mb/s in the same house. On rare occasions I have been able to get >500Mb/s on my phone. TLDR: The gateway seems limited, and isn't nearly as fast as my phone.