With the iPhone’s help, Verizon dominates summer smartphone sales

More than one out of every three smartphones sold in the U.S. this summer was activated on Verizon Wireless’s(s vz)(s vod) network, according to Kantar Worldpanel ComTech’s latest consumer survey numbers. Verizon’s share of the smartphone market jumped from 30.2 percent in the summer of 2012 to 37.1 percent in the three-month period ending in August.

Kantar Summer 2013 smartphones by carrier

What’s most interesting is what accounted for that growth: the iPhone(s aapl). AT&T(s t) has long been the undisputed king of iPhone sales in the U.S., but more and more customers are bringing their iOS devices to Verizon’s network. According to Kantar, the iPhone accounted for 44.6 percent of its smartphone sales this summer up from 35.9 percent last year. Verizon was probably helped by the fact this was the first summer an iPhone supported its LTE network as well as the first year all three commercially available generations of the iPhone worked on its 2G and 3G systems.

Kantar summer 2013 smartphone OS by carrier

Meanwhile AT&T is still selling iPhones like crazy – it accounted for three out of every five smartphones it sold this summer  – but the carrier only handled 21.7 percent of total U.S. smartphone sales, down from 28.5 percent in the summer of 2012, according to Kantar. Though Kantar didn’t release exact volumes, these shifting percentages would indicate that Verizon is quickly catching up to and may even have surpassed Ma Bell in total iPhone volumes of late.

Verizon also took market share away from Sprint(s s), which saw its claim on the smartphone sales drop to more than six percentage points to 14.6 percent. The only other major carrier Kantar found showing improvement was T-Mobile(s tmus), which increased its share from 12.1 percent to 13.2 percent. T-Mobile officially landed the iPhone this spring after years of being snubbed by Apple(s aapl), but it also launched several aggressive pricing promotions before or during the summer, which could explain increased sales across the OSes.

Kantar summer 2013 OS volumes

Kantar also found that Apple regained some of the share it lost in what is typically a slow period before its annual iPhone refresh. iOS devices accounted for 39.3 percent of all total smartphones sales this summer, up from 33.9 percent, while Android fell from 60.7 percent to 55.1 percent of the total. BlackBerry(s bbry) sales continued their decline, while Windows Phone(s msft) devices saw an uptick.