So how has Nokia managed to be the largest cell manufacturer in the world if all this is true?
Well, I think the main reason is they've kept the user interface about the same from the beginning till now and refining it without changing it.
Back in the late 90s the Nokia 3210 was using the same menu structure, keyboard symbols, even the turn on/off button is still on a similar place. That helps you not having to learn how to use every new phone you get.
Another reason why Nokia worked and still works is that it crashed not that often than other phones at the time. You could always say "Get a nokia and it won't crash". Almost the same situation as with Windows and MacOs.
Nowadays you have almost everything on your phone. The cool thing about my current Nokia is that it still works exactly the same way, it has everything I need (and a lot of stuff I don't need). It evolved so to say. And it still works great.
A good example of Nokia working great is the fact that I still see people on the street with 1996 year models - the father used it, the big brother used it, it felt like 1000 times and now the teenage girl uses it and it's still working. You can't say that for a lot of other phones.
Oh, and one other thing - the price classes:
Current nokia models start from 139 EUR (Nokia Online Shop - you can get it even cheaper) and end at 19.000 EUR + (for Vertu as Nokia Luxury line)
So you can cover the whole market...
For me right now the better combination is a Nokia phone to talk with and send SMS and the new iPod touch to have the music and the internet in my pocket - I don't like the idea to get out of battery because I surfed a bit too much and having a way to call someone because of that.