Which handsets generate the most mobile ad requests?

Admob has released Feburary numbers for requests hitting its ad-server network globally. The stats show the numbers of ad requests made in five top country markets, as well as by regional territories. Admob breaks the requests down into handset types and manufacturer.
Overall, with Februeary being a 29 day month, network impressions decreased 2.2% (2,321,477,067 for February vs. 2,374,844,534  for January), although requests increased 2.5% (2,562,527,510 for February vs. 2,500,424,720  for January)
22.1% of ad requests in our network worldwide were from Smartphones.
Of the main markets, the UK showed the most growth, withUK requests growing 23.9% inFebruary over January (in a short month) to outpace network growth.
The top devices in AdMob's top 5 markets remained the same: US (Motorola KRZR), India (Nokia 6030), South Africa (Motorola v360) UK (SonyEricsson K800i) and Indonesia (Nokia 6600).
In Western Europe ad requests were at 268,155,500 for the month, up 10.5%.
Eastern European users generated 104,824,843 requests, up 4.11% on January’s numbers.
Worldwide, most requests came from Nokia handsets at 29.4%, Motorola devices accounted for 19% – mainly down to Motorola having the top two handsets in the US., Sony Ericsson phones genrated 11.6% of ad requests.
The only European market in the top five, the UK, showed Sony Ericsson at the top of the tree, with 37% of requests, then Nokia at 29.7% requests and Samsung at 9%.
Overall, globally, smartphones accounted for 22% of all requests. Nokia devices generated 44% of all smartphone requests, with RIM devices next at 26% and Palm and Apple devices both at 5%. HTC, HP, MiTAC and Samsung smartphones were all around the 3-4% mark.
The numbers only reflect identifiable requests made to one provider (AdMob) but they do show some interesting variances, in that the top handset vendor into a market or geography does not always come out as the one generating the most ad requests. Sony Ericsson’s eight point lead over Nokia in the UK would be one example.