First off, is it possible to root the T-mobile variant of the V20? And second, is it worth it and why?
It's possible - see LG V20 Root Already Out, Allowing Tweakers To Install TWRP And Flash SuperSU : TECH : Tech Times
Is it worth it? If you want to run an app that requires root access. Otherwise no.
First off, is it possible to root the T-mobile variant of the V20? And second, is it worth it and why?