T-Mobile's update page keeps you abreast of your phone's update to Android 5.0
Ok, maybe the Nexus 5 is an obvious one to pick. Let's choose another phone. Click on the Samsung Galaxy Note 3 and you'll see that the update is in the process of being tested by T-Mobile. In fact, there are three levels and the Galaxy Note 3 is on the second level. Level one, called Manufacturer Development, means that T-Mobile and the manufacturer of a device have agreed to update the model's current OS build. Level 2, is called T-Mobile testing. In this stage, the carrier runs through the update in an effort to certify it.
When you get to Level 3, the process is completed and the update is available for the device. Some of the devices listed on T-Mobile's Software Updates page include the Nexus 4 (Level 3, Completed), Samsung Galaxy Note Edge (Level 1, Manufacturer Development) and the HTC One (Level 2, T-Mobile testing).
If you want to know where your T-Mobile branded Android phone stands in relation to the Lollipop update, click on the sourcelink below.
source: T-Mobile via SlashGear