I'm sure there are others like me. My previous job gave me a new iPhone 4s to use for work. 4 years later, I asked the IT department if I could buy it as I was familiar with it and refused all ios updates, so I did not have the battery throttling problems. They couldn't understand why anyone would want that ancient thing and gave it to me for free. Last year (2.5 years into my new job), my company changed email systems and the 4s could not support it. I needed something at least ios 12, so bought a used 5s, a case and new sim card. Under $200. My work gives me up to $200 for a phone every 2 years, so free. It's taxable and last year, my effective rate of fed and state was about 20%, so I guess this cost me $40. So at this point, $40/7 years...
I will say that one added bonus of this "new" phone is that google maps is available. There really is nothing on newer phones that I have any interest in.