I bought an almost new note 9 from Amazon 6 months ago for £150 to use as a dedicated audiobook, music and podcast player. The note 9 is the last one with the Bixby button. This was a requirement to set as a play pause button.
I rooted it, installed lineage OS with android 13 and exposed edge pro, mapped the Bixby button to play pause and rear fingerprint sensor to skip forward on up swipe and skip backwards on down swipe, froze all the unnecessary apps and the cell services.
Battery lasts for 4 or 5 days because it doesn’t search for cell signal. I only use WiFi on it.
I hope to get many years of use out it.
I had done this with an old S10 as a test base.
Great phone worth every penny.
Added to my audible wishlist, will check it out at a later date