T-Mobile to update Nexus 6 for Wi-Fi Calling starting today; Android 5.1.1 also on the way
Additionally, T-Mobile has started pushing out Android 5.1.1 for the phablet. The software version is LYZ28E and besides the usual bug fixes and stability improvements, it includes a new device Anti-Theft feature. Android 5.1.1 for the Nexus 6 weighs in at 125.8MB, and can be downloaded and installed for now only through a Wi-Fi connection. T-Mobile says that it will offer the update later for those sticking to a cellular hook-up.
T-Mobile also suggests that you have your phone charged to at least 50% before beginning the updating process. Since the update is sent out on a staggered basis, if it doesn't come in the next few days, don't threaten John Legere by offering him a free weekend at the Trump hotel of his choice. Be patient and your Nexus 6 will soon be rolling with Android 5.1.1.
source: T-Mobile, @askdes (1), (2) via AndroidCentral