When I got my 9 Pro It regularly showed i was connected to 5G I am in the Columbus Dayton area and I know it is available in this area. However it no longer shows it as an option on my device. The settings to enable it have also gone away. Is this a Oneplus issue or a Visible issue?
Recently switched over from Metro (was terrible where I am) and spoke to a rep about this. Not sure why it's not a default option in SIM & Network, but you can re-enable 5G by typing *#*#4636#*#* into the Phone app, selecting Phone information and selecting one of the NR/... networks. I just picked the one with the most range, but I think we can use NR/LTE and be fine as I have read Verizon tags our SIMs as CDMA-less (without that tag and 2G enabled, say goodbye to texts).
To turn on 5G on your OnePlus 8/pro or OnePlus 9/pro do the following:
1) Dial *#*#4636#*#*
2) Choose "Phone Information"
3) Under "Set Preferred Network Type:" choose "NR/LTE"
4) Enjoy your 5G connection!