I started with Sprint PCS back in 1997, then T-Mobile, AT&T and Verizon (in that order.)
Wow, there is no way I can remember my old phone types so I will do it like this:
A bunch of old 'dumb phones'
Blackberry 8330 Curve (VZW)
Motorola Droid (VZW)
iPhone 4S (VZW)