AT&T claims completion of a world's 'first' 5G connection. Here's why it matters to you

You're going to hear a lot of claims about "5G firsts" as the leading telecom companies slug it out to deliver the next generation of wireless. And one just came from AT&T. The company says it has successfully completed the "world's first millimeter wave" 5G connection over a live network to what will be commercially available "standards-based" commercial mobile 5G device. Did your eyes just cross? Let's break this down a bit first.