Paul1977:
The biggest issue I see with that is what happens if you leave? You will forever be getting work related calls about a job you are no longer at.
This....
Mingling you private and work stuff is gonna be a pain to untangle.... plus it essentially makes you on call 24/7....
If they wont budge, go buy a mid range android phone and get a separate number for work, that gives you the freedom to "leave work behind" something that will vanish with a single device....