Worldwide the Motorola (NYSE: MOT) RAZR V3 ranked as the most commonly used phone, while the BlackBerry 8100 ranked highest among smart phones, according to an untraditional report that evaluated market share by determining which handset models viewed text and banner mobile ads during the month of February. The numbers were released by AdMob, a San Mateo company which serves about two billion mobile ads every month. AdMob said after releasing the data for the first time in September January, it continued to get requests for the information to be updated. Still, this is one vendor’s data, so take it as such…

Here are a few of the report’s findings:

-- In February, AdMob found that 17.3 percent of worldwide ad requests came from smart phones. While RIM’s (NSDQ: RIMM) BlackBerry 8100 was the highest ranked at 34 percent, Nokia (NYSE: NOK) smart phones came in at second with 29 percent of the traffic. From there, numbers dropped off dramatically with Palm (NSDQ: PALM) coming in at 7 percent; Apple (NSDQ: AAPL) and HTC tied at 6 percent and Motorola at 1 percent.

-- When smart phone data is broken down market-by-market, Nokia is the clear winner with the highest percentage of users in every market but the US. In the US, RIM had 39 percent; in India, Nokia had 89 percent; in the UK, Nokia had 67 percent; in South Africa, Nokia had 89 percent; and in Indonesia, Nokia had 86 percent.

-- In the U.S., iPhone traffic flattened slightly during February, consistent with the theory that people use new devices after receiving one as a present, only to have traffic slow in the following months.

-- The top overall devices in both the feature and smart phone categories remained the same in AdMob’s top five markets compared to January. The Motorola KRZR in the US; the Nokia 6030 in India, the Motorola v360 in South Africa, the Sony (NYSE: SNE) Ericsson (NSDQ: ERIC) K800i in the UK and the Nokia 660 in Indonesia.

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