finding TMobile cell tower locations

If you look to the left panel while it is in the "General" view then mouse over that info and scroll down you can see the legend and get more information about what you are seeing. Expand the various data options. Poke around a bit to learn the interface and discover more. 

Once you select the provider then you can filter by 4G LTE and 5G NR cellular networks. To reduce clutter select one or the other. You will see many more 4G LTE tower references vs the 5G tower references. So if you want to find a 5G tower by the PCI, physical cell identifier, then look for towers in your area. If you allow the initial location to be used it helps. Do avoid ticking on any adds unless you just want to go there. I avoid all the adds. I made an account and login but I have NOT seen any adverse impact due to that. 

If you have an Android device and use their application there is some benefit to having the account. You can read about using their application and how to feed the database information about the tower and the cell delivery. When people contribute to the database it makes the solution more complete. Unfortunately with Apple IOS devices there is no application that can upload the findings so no contribution can be made as such.