The sales figures for the Nexus One's first week sales are in, and the results aren't what Google was hoping for. The actual figures are based on Flurry, which tracks application usage per phone in the market, and approximately four out of five applications on the iPhone.
Flurry's tracking system works with more than 10,000 developers' applications on the iPhone and Android platforms. Based on the applications used by new mobile phone users, Flurry can track roughly how many users purchased and used the phone in the first week.
Flurry tracked about 20,000 users using the Nexus One phone from January 5 – 12, 2010. The MyTouch 3G launched back in August 5, 2009, with roughly 60,000 users tracked in the first week, three times more than Nexus One.
The Motorola Droid had roughly 250,000 users monitored in the first week of sales, 12 times that of the Nexus One. The Apple iPhone 3GS had an estimated 1.6 million users tracked in the first week of sales, selling over 1 million units in three days of its launch. It's important to note that the iPhone sales were based across 8 countries compared to just the US for the other devices.
Take note that these numbers are based on Flurry's tracking system for the first week of sales and may not reflect actual handset sales.