Phone Magic (BusinessWeek Online) BusinessWeek Online - Hip-hop impresario Russell Simmons took one look at the Motorola  Razr V3 mobile phone and declared it "hot." After all, at half an inch thin and just 3.35 oz. -- with the look of a classic straight-edge razor -- the Razr is, well, quite sharp. But what's most remarkable about this svelte pocket pleaser is that it squeezes a video-clip player, zoom camera, and polyphonic speakers into a matchbook-thin frame no wider than a credit card. "Just like a cool pair of sneakers or a watch, a phone says something about who you are," says Simmons in an e-mail. ...