Both AT&T and Verizon have given up US iPhone share to Sprint with the advent of the iPhone 4S, according to data from Localytics. Whereas 60 percent of iPhone 4 owners are on AT&T, and 40 percent are on Verizon, AT&T's lead is just 56 percent for the iPhone 4S. Verizon appears to be suffering the most with the new phone, sitting at 32 percent; in all Sprint currently has 12 percent of 4S subscribers.
