Providers are in the sales business. I'm in the sales business (but I provide something else.... I have customers (global) who also call me at odd hours, make outrageous requests at the last minute, etc. Yeah, sometimes its annoying, but without customers I have no job and no money. I have "regulars" too, but i can't count on them to always provide me with regular business. Besides, unlike my business, this kind of business is sometimes as much about the moment as it is for planning. Very few of my customers can drop $50k or more on a whim. Now if I only got to keep all that...
But it also goes with the job. When I go to bed my phone goes in the other room. Nothing you do (nor I) is an emergency. But sleep is a necessity.
You should keep your provider business on a separate phone. Yeah, it can be annoying, but its the best way to do it. That allows you to have your on-call phone with you and your work phone you can turn off/silent as required.