Sprint announces its 1st 5G data call using 2.5GHz and Massive MIMO,
http://snip.ly/97sht0#https://insidetowers.com/cell-tower-news-sprint-completes-worlds-first-5g-data-call-using-2-5-ghz-and-massive-mimo/

Days after T-Mobile announced its 1st 5G call using 600 MHz,
https://www.zdnet.com/article/t-mobile-marks-5g-milestone-with-first-data-call-on-600-mhz-spectrum/
https://www.rcrwireless.com/20190107/5g/t-mobile-us-completes-first-5g-call-at-600-mhz

Days after Verizon Wireless and T-Mobile called out AT&T for claiming to be the 1st
to offer a mobile 5G device over a commercial 5G network (two weeks ago).
https://arstechnica.com/gadgets/2019/01/att-decides-4g-is-now-5g-starts-issues-icon-changing-software-updates/
https://techcrunch.com/2019/01/08/verizon-and-t-mobile-call-out-att-over-fake-5g-labels/

Two months ago Verizon Wireless claimed the world’s first 5G data transmission using a
smartphone over a commercial 3GPP 5G New Radio (NR) network
https://www.verizon.com/about/news/verizon-completes-first-5g-data-transmission-smartphone

Four Months ago Verizon Wireless completed a transmission on a commercial 3GPP
5G New Radio (NR) network four months ago using millimeter wave spectrum.
https://www.phonedog.com/2018/09/06/verizon-completes-first-over-air-data-transmission-commercial-5g-nr-network

It was almost a year ago when Verizon Wireless announced it had made the 1st
over-the-air call on a 3GPP-compliant 5G New Radio (NR) system using licensed spectrum.
https://www.fiercewireless.com/wireless/verizon-boasts-first-5g-call-using-3gpp-based-standards