T Mobile’s Galaxy Tab S 10.5 is getting an OTA to Lollipop today. This follows last week’s update on the AT&T device and the WiFi model. If you have one, you should check that Update now notification button.
The update itself brings the Galaxy Tab S to software version T807TUVU1BOE1. The download will be around 1.1GB so be sure to get near a WiFi connection while you’re at it, if you don’t want you data to be cut in half by an update.
Source: T Mobile