I just came across the Officeworks trade in program for Phones, Watches and Ipads etc. Supported by Moorup.
They seem to offer a lot more than other similar services such as JB Hifi and Mobile Monster.
For EG: For a iPhone 12 Pro Max 128gb
JB = $550
Mobile Monster = $580
Officeworks = $750
So it seems to be lots of on offer using their program. Of course I would say they each phone varies, but it seems iPhones are much better at OW.
Certainly handy if intending to upgrade etc.
Put in a few devices from newish to old and cex beat OW every time. Didn't try iPhones though.