AdMob has released its Mobile Metrics Report for March and in this month’s report, the US-based ad network studies the growing popularity of Android OS with the Android traffic increasing on its network at a rate of 32 per cent every month. AdMob’s data evaluates market share through the share of mobile ads served from its network.

Motorola Droid grabbed a major chunk of 32 per cent share in the total Android traffic generated. Another surprising thing that we noticed was that more than 54 percent of the Android traffic was generated from devices with QWERTY keyboards. The list includes Motorola’s Cliq, Droid, Samsung Moment, HTC Dream and few others. Where Motorola Droid caught a significant share in March, Google Nexus One almost lost its appeal this time as AdMob’s stats suggest that the handset’s share declined to 2 per cent in March which was as high as 74 per cent in September last year.

Talking about the traffic generated by iPhone OS on Admob’s network, the iPhone 3GS leads the segment by contributing to 39 per cent of the total iPhone OS requests. The second generation iPod touch and iPhone 3G captured 25 per cent and 20 per cent share respectively in the total iPhone OS requests. However, the first generation iPhone seems a little outdated as AdMob’s figures point out that the phone managed to produce just 2 percent requests on its network in March.