The current iPhone design, it turns out, was in the works since 2006—and was so influenced by Sony that they even put its logo on the mockups. Court filings in the ongoing legal battle between Apple and Samsung reveal an early concept by Apple designer Shin Nishibori which closely resembles the current-gen iPhones, complete with the silver band. [The Verge]
Early generations of production iPhone, however, went for a more organic look with a smoothly-curved back.
For reference, here is one of the many smartphone models that Sony (then in partnership with Ericsson) offered around 2006/7. It's remarkable because it clearly does have the same pedigree in mind, design-wise; it's just made of plastic and isn't very nice.