No, you don't want a first-gen 5G smartphone

5G smartphones are still months away, but the carriers are already shouting about their fresh new handsets. Sprint joined the 5G hype club today, announcing it's working with LG on a special device to usher in its fifth-generation cellular network next year. It's hot on the heels of the Moto Z3, a "5G Ready" phone you can buy today from …