In recent news, Nokia said it can instantly migrate 5 Million legacy 4G radio units to 5G.
All it takes is only a software upgrade to the new 5G software that offers seamless transition for installed 4G/LTE radios to 5G/NR
The move avoids the need for tower climbs enabling immediate enablement of 5G/NR.
During the initial launch they had 5G on 600 Mhz with 10 Mhz BW and in some cases with 5 Mhz BW for coverage.
Anyways Verizon has highest speeds in US right now ~ 4 gig on FR2.
I’ve seen full 2.5 Gbps pdsch throughput for verizon mmwave
4 CA
600 Mbps for sprint 2.5 Ghz
And 300/400 Mbps for 600/850 Mhz TMO/ ATT 5G
Though LTE TMO we have seen 700 Mbps 5CA4G