my friend works in a phone shop and when my father was upgrading his phone 3 days ago it was a choice between the W910 and the K850. My friend said NOT to get the W910 as theyre getting so many returned with faults. He has had something like 12 returned in 5 days, and bearing in mind this is only a small town that he works in. This is a high proportion of returns. My father went for the K850, which is a fabulous phone!