Is it common to have a list of every employee's mobile phone? I would guess a lot of firms just have informal lists of phone numbers held by managers and colleagues.
Plus if there was a list, wouldn't it be on a computer that's currently off?
Most managers would have their reports' mobile numbers. Just start with the C-suite and work down. This is a case of hierarchy actually being an advantage...
My calculator's a computer, but I don't call it that. My game systems are all computers, but I don't call them that either (and never have, unless I was discussing semantics).
It may be, but it is not in hardware or software lated to the major "desktop" platforms. And they are by design far more locked down than your average laptop or desktop (just wish said locked state didn't leave the OEM so much in control).