Thanks Deleted, that's correct and thanks for providing guidance here as this is a complex topic.
Andrew_Allston just to add to this, Polycom and Microsoft have been working very closely on ensuring both existing non-Android capable phones have a good (albeit non-native) path via Microsoft's 3PIP Gateway. We're also working on future Teams native IP Phones and have even launched an upgrade program whereby folks can buy VVX 3xx, 4xx, 5xx and 6xx devices now and get a native phone as soon as they launch. I know this isn't ideal but the timing of our Android range was a little behind on the native Teams IP Phone schedule, but TRUST me it'll be worth the wait :smileyvery-happy:
For more information on the upgrade plan refer to this page on the Polycom site and some information on the Microsoft 3PIP Gateway here.
Finally I'd recommend watching this presentation from Ignite that also goes into more details regarding the entirety of the Polycom range of Skype for Business devices.