iPhone owners are the single largest source of mobile WiFi data traffic worldwide, particularly in the US and UK, according to AdMob.

In the US, the Apple handset represents 50.6 per cent of all requests from handhelds of any kind, followed by the iPod touch, which accounts for 28 per cent of the requests.

The best non-Apple device, Sony’s PSP, only manages 13.1 per cent of this traffic.

Even further down the scale come the T-Mobile Dash, G1 and various BlackBerries, which each have less than one per cent of WiFi use.

UK figures are similarly weighted and give the iPhone the lead at 46.1 per cent, followed by the iPod touch at 21.8 per cent and Nokia’s N95 at 16.7 per cent.

The Apple device is also more than twice as likely to be used on Wi-Fi than other devices and is used 42 per cent of the time on these hotspots in the US rather than EDGE or 3G compared to no more than 10 to 20 per cent for competitors.

In the UK, this reaches 56 per cent.

The phone’s presence helped roughly double the use of mobile WiFi to 8 per cent in both countries between October and November.

Increasing numbers of smartphone users are taking advantage of WiFi to make voice calls over IP networks.

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