8310 = GSM curve with GPS
8320 = GSM curve with wifi
8330 = CDMA curve with GPS
in all of their current product lineup, the first two digits refer to the generation and series, i.e. 8 = 8th generation (original model 8700), 3 = device family (3 = curve, 1 = pearl, 8 = enterprise/business).
the last two digits are for the receivers installed, i.e. 8300 = GSM only, 8310 = GSM, with GPS receiver, 8320 = GSM, with Wi-Fi, 8330 = CDMA, with GPS
my av was not safe for preschoolers.