Re: Naming/Numbering
"Well a similar strategy doesn't seem to have done BMW any harm."
But they don't launch new models every ten minutes as Microsoft seem to. So everybody knows what a BMW 320 is - a two litre four door mid sized saloon. BMW can happily launch a new 320 every five to seven years, with annual model refreshes, and it's still the same answer that its a two litre four door mid sized saloon.
Microsoft and phones? I'm with the OP, in that I'm confused. There's too little difference between a lot of the models, and any attempt at hierarchical numbering is doomed because of the fast development of phone technology.