How do I discover the latest Android OS available for a device on a carrier? How do I discover the latest Android OS version available through standard support channels (no manual rooting or reflashing) for a device? In particular, I am interested in the Samsung Galaxy Note 3 for Verizon. Note, I am not interested in actually installing, just in finding what is available.
If you're not rooting or manually flashing, just call Verizon, they'll tell you the latest version they have available.  It's almost certain to be the same that's already there, unless the device has been stored for a good while and thus kept from getting a pushed upgrade.