whitepagesiPhone app shoppers outnumber Android consumers several times over. But WhitePages, which makes popular phone directory and caller-ID applications for both platforms, reports a surprisingly high conversion rate among Android users compared to their iPhone counterparts.

phone_androidWhitePages VP of Mobile, Kevin Nakao, told me in a phone call, “Conversion rates and premium penetration rates are better than we expected. We had projected five to six percent of people would buy the app. Instead we’re seeing 13 to 15 percent conversion from our free trial Caller ID users to the $6.99 (for 6 months) premium version.”

Conversion rates have been disappointing for mobile app developers. Smartphone owners like to download and play with apps, but most prove to be window-shopping.

Below is WhitePages’ demo video of the Android caller-ID app in action.

Have you got stats on app sales you’re willing to share? Email me at paul@venturebeat.com.