I just got cable internet service activated today (just moved) and can confirm that wifi works. I cannot login to the servers with mobile data (LTE through T-Mobile) on my OnePlus 6T. I can login to the servers on mobile data using my wife's OnePlus 5, even with my SIM card, so it does not seem to be blocked by the network. Possibly a device issue? I am going to be rooting my OnePlus 6T soon and installing a custom kernel and ROM. This way I can determine if the stock T-Mobile ROM is the issue, or if it indeed might be the device itself.