The first. Nokia 3210. Just about everyone had one of these. Massively popular in 1999, with interchangeable front covers and the fabulous Nokia snake game.
Nokia 5210. You could drop this on the floor and take it in the shower
Sony Ericsson Elm - the last phone I owned before getting a smartphone
My first smartphone
Sony Ericsson W800 - 2005. Had this while I was at uni