Like @mikez, I also had a 6150 back in sixth form and felt very superior to hoi polio with their mass market 3210s.
But my favourite non smartphone was the 6210 I had in my first year of uni.
My favourite phone/smartphone ever was the Orange SPV C500, made by HTC.
I’ve never been so blown away by a gadget. It was so far ahead of any other phone I’d seen in functionality. I spent far too much of my time on coolsmartphone and modaco learning all about Window Phone and everything it could do.
Also remember hundreds of commutes spent watching divx encoded tv shows and movies on the tube. Often with people staring at me in amazement.
It was the future, long before the iPhone released and brought it to the masses.