We set up the iPhone 3GS and 3G on the Crave Towers Wi-Fi network and set to streaming Leonard Cohen Live in London on BBC iPlayer.

Although we tired of the Canadian crooner after a couple of hours, the iPhones lasted longer.

The old boy 3G gave up with exhaustion after 3 hours and 2 minutes of classics such as Bird on a Wire and Hallelujah.

The young whipper-snapper 3GS toughed it out for exactly 5 hours of septuagenarian renditions of So Long, Marianne.

That's 118 minutes longer, or a 65 per cent improvement. Applause for the 3GS! And encores for Len.

Click through to see the how the phones handle the all-important 3G calling.