If you don't do any work-related activities on it and you have a work phone, how/why are they requiring you to get a new personal phone?
If one does do work things on their phone and, especially if you have MDM installed, it is of course reasonable to require you to be on a current OS. And Apple is pretty good about length of support but it's not forever.
If one does do work things on their phone and, especially if you have MDM installed, it is of course reasonable to require you to be on a current OS. And Apple is pretty good about length of support but it's not forever.