[sudo_and_pray]

Probably Linux phones, they are not there yet, but maybe by the time Android becomes an iOS it will be there.

Problem will be with banking apps and such, well you can get an used iphone and in lockdown mode it should be fine even if it reaches EoL.

[schlauerfox]

Bought a used iPhone 7 for a specific project requiring a supported OS (iOS15) and having a hardware security module and the phone worked fine for that but Microsoft Authenticator refused to install below iOS 16 for no obvious reason.

[wltr]

My bet is that YOLO is the reason for Microsoft being unable to make the authenticator work on an older iOS.