One plus 5g devices are not all compatible with actual 5g networks in Canada. You can check phones bandwidth and line it up with carrier band with. From my experience you will still have faster data speeds even if it doesn't show 5g
Make sure all the cellular bands are selectionned in your phone settings and that you are in a area that has 5g Also 5g signal doesnt go into building has well as LTE or 4g so it is normal to not get 5g in some buildings Here's the coverage map https://www.publicmobile.ca/en/on/coverage
