In many Verizon Wireless stores, the two phones are selling neck-and-neck, after calling 150 retail locations in 22 major U.S. cities. Of those stores, 28 percent said the HTC Thunderbolt was outselling the iPhone 4, and 11 percent said the iPhone was outselling the Thunderbolt.

Sure, it's anecdotal evidence--I certainly wouldn't run around proclaiming that the Thunderbolt is outselling the iPhone--but Piecyk's findings at least show that the Verizon iPhone hasn't endangered Android.

Before Verizon started selling the iPhone in January, some analysts and pundits weren't convinced that Android could endure:

"[Adding] Verizon would significantly blunt the competitive threat from the Android platform, whose favored status at Verizon has been critical to its building momentum," .

"A lot of people who bought Android phones were buying it in lieu of an iPhone because they couldn't get one on the Verizon network," .