T-Mobile does not mention a Lollipop update for the G3 on their official website. Does this mean that we won't get the update? Since I'm still a new member, I can't post links, so I had to modify the link. You should be able to Copy/Paste this address.
//support.t-mobile.com/community/phones-tablets-devices/software-updates
//support.t-mobile.com/community/phones-tablets-devices/software-updates