New IPhone Redesign to Sell 10 Million Units Within Weeks

Apple Inc.’s debut of its redesigned iPhone will test anew its high-stakes strategy of once-a-year upgrades for a product that accounts for about 70 percent of the company’s profits.

The new phone, to be introduced tomorrow by Chief Executive Officer Tim Cook, will probably have a new hardware design, including a bigger screen and thinner body, as well as new mapping software and compatibility with speedier next-generation data networks. Analysts predict the iPhone may be among the biggest consumer-electronics releases in history. Still, Apple’s reliance on the device leaves Cook little margin for error.