It looks like the iPhone 7 is a hit. Apple shipped 78.3 million iPhones during the quarter ended Dec. 31, 2017, the first quarter of its 2017 fiscal year. That's a record, and a nice jump from a year ago, when Apple shipped 74.8 million iPhones, booking $51.64 billion in revenue. It's also better than expectations. Analysts were expecting the company...