Change Device Names

I'm a 11 yr old tmobile customer and couldn't wait to get the home internet which works well, and the Advertises naming devices, BUT, I am not able to:

1. Change devices names, afterall 

2. Ability to pause or control the devices only because I don't know who's device it belongs.

Spectrum masters this awesomely identifying devices and ability to rename, but is more expensive and you have to rent their equipment unless you want to purchase them. 

Since my household has so many devices I need to control, I decided to purchase a router and modem and just keep Spectrum. Sad for t-mobile to lose a customer over such a simple fix, false advertising :(