The iPhone was the top-selling smartphone at AT&T, Verizon, Sprint and T-Mobile for September, October and November of this year, according to Canaccord Genuity analyst T. Michael Walkley (via AppleInsider). We previously covered Walkley's September numbers. The iPhone 5s, which came out in the second half of September, has proved extremely popular with customers and has only recently gotten close to a supply/demand balance.
