My response to this request would be "I do not have a smart phone for work." On the few occasions I've been asked to be on call for a job this has been my reply

My response to this request would be "I do not have a smart phone for work." On the few occasions I've been asked to be on call for a job this has been my reply. It usually gets a "okay we will provide you with a phone," which is a better solution. Then I can choose when and where to turn it on and issues with the device are their responsibility.