The iPhone accounts for just 4% of the EU big 5 mobile market in terms of handset penetration

"The iPhone currently represents just 4 percent of the EU5 (U.K., France, Germany, Spain, Italy) mobile market, but 18 percent of the overall EU5 smartphone market. However, the iPhone has facilitated fundamental change in mobile user behaviour and ignited fierce competition among device and operating system (OS) providers.
iPhone owners are the most voracious consumers of mobile media: 94 percent use mobile media, 87 percent use applications and 85 percent browse the mobile internet. With just 4 percent share of the European market, iPhone users represent 12 percent of all mobile media users."
Source: Press release from comScore, 23rd June 2010
(More data on operating systems in the full press release)