I work from home and the company pays for the landline and fax machine! Yet they won't pay for internet! How retro is that? 'Scuse me while I flip the cassette tape over ... I just finished listening to Side 3 of "The Last Waltz"!
I haven't had to pay a cell phone bill in over ten years. There's a plus to the work-issued phone.
The only benefit I can see for BYOD, is that if it's your personal device, the company does not own it nor its contents and therefore doesn't have the right to snoop. (Or do they, if you're using it for work?)
It's these days not so much about promotion, as running faster than the next guy, when the layoff lion starts to chase people. The more you endear yourself to management, the father you start out when the lion comes to hunt.