T-mobile USA carrier is now updating Nexus 6 devices to Android 5.1 lollipop operating system. This information has been posted in official support page t-mobile. The carrier will roll out the android 5.1 update via OTA (over-the-air) which can be downloaded with WiFi only. The software update will enable device anti-theft feature, bug fixing and improved software stability. To update Nexus 6 to Android 5.1 lollipop it requires LRX22C build number, 409 MB free space, battery life 50% or above and data connection to download. The user can manually check for the update by choosing Settings > About Phone > System Updates > Check now option. Once the update is available follow the instructions to download and install the update. Once the device has been updated you can check the build number which will be LMY47M.

Check out Nexus 6 Full Specifications