I would totally do this, but I have to have a smartphone for PagerDuty and Slack if I’m on-call. Which for me is basically 24/7 since I’m a SME in a few areas. I figure most of you are in a similar situation, I don’t see a way around that.
If your employer requires the use of a smartphone, your employer should supply the smartphone. Or any other piece of equipment you need. You shouldn't use your own devices for work purposes.
If you have to use smartphone for your work you have to. I don't use smartphone, if smartphone would be required for work , first they would have to get me smartphone, and buy me applications. And when I change job i just return it.
What about receiving an automated SMS or phone call when an incident is created? That's anyway how I usually do it even though I'm using a smartphone.
See, that kind of situation has me thinking owning a work phone and a personal phone could be beneficial. Obviously, don't browse social media on your work phone and you should be fine.
How about receiving 2 dozen spam phone calls and spam text messages? IMO, because of this issue older (not smart) phones have become useless.