According to a recent survey by mobile advertising network Greystripe, Singapore is number six its list of iPhone-using countries. Remarkably, Singapore is ahead of much bigger markets like Japan (6), Hong Kong (7), Mexico (8) and Germany (10). The top five are the US, Britain, Canada, Australia and France.
This list ranks countries by the number of ad impressions delivered by Greystripe to iPhone users in those countries.
Greystripe's full report is available here.