The 10 billionth app was downloaded on Saturday — and it was the free game Paper Glider. The developer, Neon Play, is understandably thrilled with their good fortune. In their press release, they exult at the 1 in 10 billion odds. The lucky downloader is Gail Davis, who actually hung up on Apple when they called to tell her, thinking it was a prank call. "Not interested," she said, and hung up the phone. Not interested in $10,000?