CNBC.com’s MacKenzie Sigalos brings you the day’s top business news headlines. On today’s show, CNBC.com Apple reporter Kif Leswing breaks down the tech giant’s big iPhone 12 reveal, including the implications for the 5G network. Plus, CNBC.com’s Melissa Repko dives into Amazon’s Prime Day event this year, and explains how competitors like Target and Walmart are better positioned than ever to eat (some of) Amazon’s lunch….