Rich updated to a smartphone out of necessity. He's hearing about the Apple Watch Series 4 and its heart features, but it says he needs "number share" for it. What is that? Rich says that the Apple Watch Series 4 is not only a smart watch, but an FDA approved medical device. He can actually take an ECG with it. But he'd need the higher end LTE version for $500, and number sharing, means he'd have to pay $10 a month to share his phone number with his Apple Watch.