Over the past few years, Apple has spent billions of dollars trying to develop its own modem chip to replace the Qualcomm modem chip it uses in iPhones, but according to the latest reports, Apple is unrealistic about the project's goals, poorly understands the challenges involved, and its prototype is completely unusable.。The extension of Apple's agreement with Qualcomm to acquire modems for another three years highlights the seriousness of Apple's setback。