Apple iPhone Duo review: This changes everything

Apple's iPhone Duo is an important phone. The iPhone has been around for two decades, and this is the first time Apple has tried something completely different with its best-selling product. Other companies have had foldable phones for years, but none of those carry the weight of a foldable iPhone. Apple’s ecosystem of iPhone-related products, services, apps, and accessories is vast, and this is a massive new entry in that book. After a week with the iPhone Duo, I’m happy to report that Appl