Samsung Galaxy Note 5 Verizon and AT&T variant received Android 6.0 Marshmallow update in the month of March this year. Sprint also rolled out the Android update for this smartphone in the end of the same month. Now, there are reports that T Mobile is doing the same thing and the update is available over-the-air and weighs 1,420 MB. Also, make sure that you download the update over Wi-Fi.
This update brings along some changes to the pre-installed application package such as Facebook Messenger, Instagram and WhatsApp.