Sonos don't make phones so have no incentive to oblige users to buy another one.
This is about Apple and Google stopping support for older versions of their OSs, meaning the phone cannot keep up with ever increasing demands.
Does it come as a surprise to you that the cause of phone obsolescence is the phone manufacturers? Please show some sense.
If your old phone runs iOS, go get SonoPhone from the Store. It runs on pretty ancient iOS versions.
