Also with the breaks, CDMA model of the iPhone 4 is exactly the same as the 4S.![]()
Except for that little SIM tray on the 4S as the give-away.
For all the other convolutions, this is really the simplest/easiest mechanism:
Look at the right edge, the 4S has two black lines and SIM tray.
Two lines and no tray = CDMA iphone4, One line and SIM tray = GSM iphone 4.