Well unless someone is living in a cave or locked in your underground dungeon with a poolball in each orifice, then most people have a phone and a mobile. So if I were to say "give me a call on the mobile", then you'd know I'm out.
Not in the Blackberry or Mizer sense of course.
The make and model of said phone being redundant, for instance; I wouldn't tell you I was swinging round to pick you up in my <make, model, engine size, horsepower rating, wheel size> car because, well, that would be fucking cuntish in the extreme.
Not nearly as cuntish as calling your mobile an iPhone or Blackberry though.