Mine was a Siemens a50, which got returned a week later because the spongey buttons wore out and no longer clicked =/
http://en.wikipedia.org/wiki/File:Siemens_A50.jpg
I replaced it with a Sony CMD-J70, twas a great phone that used a wheel on the side to scroll through the menu
http://lmgtfy.com/?q=sony+j70
When the 3 network came out I moved onto the NEC 313, then the Nokia 7600, then I had a NEC 338 for a week, then a Motorola v600 which I broke when I got curious about how the top half of a flip phone works, then a Sony Ericsson t610, started my first job and got a Motorola e1000, which I replaced with a LG U890 then got a Nokia 5230 which was recently replaced with a HTC Mozart (WP7) that my brother gave me, when WP8 comes out it'll be replaced with a Lumia 820 or 920 (finally, built in wireless charging!).
That's my entire phone ownership history, even though you asked for just the first
