[DoubleGlazing]

I've had issues in the past with employers wanting me to add work email and work apps to my own phone.

I always refused. My attitude was, like you said, if you want me to carry around a device connected to my work, then you need to pay for it.

But my main reason why though was knowing that managers preferred staff to put work email etc on personal phones, not due to the cost of buying devices for employees, but because it blurred the lines between personal and work domains. You can switch a work phone off at 6:00pm and turn it on again at 9:00am. With a personal phone you have to set up do not disturb profiles and stuff like that to achieve the same separation because you aren't likely to turn it off in the evenings. Admittedly, it's not the hardest thing in the world to setup - but still a bit more effort that just being able to hit the power button.

I still had to deal with the extreme annoyance of having my personal number passed around the company without my permission.