On what platform should you build a mobile application - iPhone, Android, RIM? Mobile advertising network Admob (soon to officially be a part of Google) has made available its October 2009 Mobile Metrics Report which might provide some answers.

New devices running the RIM and Android Operating Sytems are generating an increasing share of requests. Requests from Android devices in particular increased (5.8 times since April 2009) in the AdMob network. Additional highlights from the report include:

- In October 2009, 70 percent of iPhone OS requests came from the iPhone while the remaining 30 percent came from the iPod touch.

- In the US, the RIM 8300 Curve and 8100 Pearl series devices have consistently remained in the Top 20 devices over the last two years. In the UK, the 9000 Bold and 8900 Curve have seen strong growth and are now the number 10 and 11 devices, respectively.

- In the US, Android had 20 percent share of smartphone traffic, up from seven percent six months before, and the HTC Magic (myTouch 3G) and HTC Dream were both Top 10 devices. In the UK, the HTC Dream, HTC Magic, and HTC Hero are all Top 10 devices in the AdMob network.

- The Motorola CLIQ has also seen fast pickup since its launch at T-Mobile in the US and generated six percent of Android traffic on November 18.

- The top Symbian and Windows Mobile devices have not changed in 2009 and both platforms have lost smartphone share. One of Nokia's first touchscreen models, the 5800 XpressMusic, is the one of the few newcomers to the list of Top 20 Symbian devices in 2009.

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