I have two phones. A personal one and one provided by my company. I like being able to turn off my work phone when on holiday, etc and keep my personal life separate.
I do know a lot of people who sold their personal phones when given a work phone and use it for both. Saves some money I guess but no thanks.
I also know people who have two phones but install all the work apps on their personal phones to make it easier for them. No thanks!