One extraordinary person each week for 4 weeks will take the new Sony Ericsson K850i through its paces. We'll be bringing you their images testing the new model's range of features including Photo fix, BestPic, a super bright xenon flash and even scene modes to optimise image settings.

Week 1
David Phelan
Technology editor

Week 2
Simon Calder
Travel editor

Week 3
Dom Joly
Comedian and columnist

Week 4
Alex James
Musician and contributor