gollum123 writes: Smartphones based on Google’s Android mobile operating system have outsold Apple’s iPhone in the U.S. during the first quarter of 2010, according to a report by research firm The NPD Group. The data places Android, with 28 percent of the smartphone market, in second place behind RIM’s Blackberry smartphone market share of 36 percent. Apple now sits in third place with 21 percent. NPD points to a Verizon buy-one-get-one-free promotion for all of its smartphones as a major factor in the first quarter numbers. Verizon saw strong sales for the Motorola Droid and Droid Eris Android phones, as well as the Blackberry Curve, thanks to its promotional offer. Verizon launched a $100 million marketing campaign for the Droid when it hit the market in November 2009, which likely attributed to strong sales in the first quarter as well.