I'm going to attempt to make this as accurate as possible, lol, but this is in no particular order, except the first 3, which are the 1st 3 phones I ever owned. (The Verizon & Sprint phones are also in order of ownership.)
Cingular/at&t Mobility
Nokia 3390
Sony Ericsson T306
Nokia 3595
Sony Ericsson T226
Nokia 1100
Nokia 6010
Pantech C3 (2)
Nokia 6030 (2)
Sony Ericsson J220 (2)
Motorola V170
Samsung Blackjack (owned for a weekend)
Nokia 6350 (Owned but was letting someone use it, never got back)
Samsung A767 (Owned but was letting someone use it, never got back)
LG Neon (Owned but was letting someone use it, never got back)
Samsung Magnet (Owned but was letting someone use it, got back)
LG Xenon
HTC Pure (The phone dual booted into Android. Got my first taste of Android thanks to it.)
Apple iPhone 3Gs
Apple iPhone 4
Nokia 2610 (2)
Verizon Wireless
LG Decoy
VZW Blitz
LG enV 2
Samsung Fascinate (2)
Samsung Alias 2
HTC Droid Incredible (2)
Motorola Droid 2 Global
Sony Ericsson Xperia PLAY
HTC Trophy
Sprint
HTC Evo Shift 4G
Sprint Phone Connect
LG VIper 4G LTE
In all I've owned somewhere around the 38 phones I listed. There may be more.