You know they'll give a low-tier samsung with physical buttons that barely passes for a smartphone and you'll complain in less than a week that you can't install work apps on your personal phone.
The hassle of carrying an extra device, charging it, storing it and taking care of it is exactly that: a hassle.
But, do note that we were talking about a phone for 2FA and you're talking about a phone for on-call. I'm too senior for on-call, but I need 2FA daily.