Many iPod users will switch network for iPhone - iPod/iTunes - Macworld UK

"The iPhone looks set to make a big impression when it launches in Europe.
A pair of Europe/UK surveys published today reveal that almost half of Europe's iPod users participating in its 2,000-person pan-European survey by Canalys said that they are likely to consider Apple for their next mobile phone.

“Apple’s rating improves dramatically when you talk to existing iPod owners,” said Pete Cunningham, senior analyst at Canalys. “Almost half the respondents who owned an iPod rated Apple as likely to be considered for their next phone, compared to just 20 per cent for those who didn’t have an iPod, and they were five times as likely to give Apple the highest rating. There is a lot of loyalty that Apple can tap into.” "