iPhone (8 GB)
iPhone 3G (black, 8 GB)
iPhone 3G (white, 16 GB)
iPhone 4 (black, 8 GB)
iPhone 4S (white, 16 GB)
iPhone 5C (white, 8 GB)
iPhone 5S (black, 16 GB, my wife's current phone, although see below.)
iPhone 6S Plus (rose gold, 16 GB, my kid's current phone, see below.)
iPhone 7 (black, 128 GB, my current phone.)
All have been originally AT&T or T-Mobile, all now unlocked.
My kid has been complaining about running out of space, and my wife has been complaining about screen size, so we're probably going to get the kid a refurbished 6S Plus 64 GB or bigger, and pass the current 6S Plus 16 GB to my wife.
Have formerly owned a 6, 6S, and 6 Plus, but those were traded in for the current 6S Plus and 7. (6 upgraded to 6S upgraded to 7, 6 Plus upgraded to 6S Plus.) Also formerly owned a second original iPhone, but sold it a couple years ago to a collector. (Keeping my "purchased day of release" original iPhone, though. Along with the original Apple Bluetooth Headset.)