Android took 64% of smartphone sales in 10 countries polled. iPhone led only in Japan.

Source: Kantar Worldpanel ComTech.

FORTUNE -- According to a report issued Monday by Kantar Worldpanel ComTech, Google's (GOOG) Android gained market share in all 10 countries surveyed to achieve an average 64% share of smartphone sales.

Android's strongest showing was in Spain, where its market share measured 93.5%. Its tightest race was in the U.S., where according to Kantar Android holds a slim but growing lead over Apple's (AAPL) iOS, with a 49.3% share to the iPhone's 43.7%.

Readers at TechCrunch, where this chart first appeared, have already pointed out that Kantar's U.S. numbers don't jibe with the quarterly reports of the U.S. carriers that actually sell the devices.

According to AT&T (T) and Verizon (VZ), the iPhone last quarter accounted for 80% and 55% of smartphone sales, respectively. In Kantar's survey -- based on a total of 240,000 customer interviews over the course of a year -- they accounted for 63% and 45.7%, respectively, in the same three-month period. That's a big enough discrepancy to wipe out the 0.9% of U.S. market share Kantar says Apple lost year over year.

The headline of Kantar's report, for what it's worth, was Windows sees steady growth in the US in Q1 2013.

Kantar, it should be noted, is a subsidiary of the London-based WPP Group, which has a deal with Microsoft (MSFT) to sell online ads and a separate deal with Samsung to do business-to-business marketing.