https://www.cnet.com/news/super-bowl-2019-are-the-wireless-networks-up-to-snuff/ > Sprint has upgraded cell towers with its Massive MIMO beam-forming technology ahead of the 2019 Super Bowl game in Atlanta.  > Because 5G builds on 4G foundational technologies, carriers will be able to reuse this gear when it's time to light up the next wireless generation simply by upgrading the software.