Question about Samsung Galaxy Note 20 Ultra

hi can it be that i have an older nano sim from salt? all the 5g devices i had lately, i test a lot, had no 5g reception in zurich basel bern luzern geneva.had note10+ 5g, galaxy s10 5g, s20 ultra 5g, lg velvet 5g, lg v60 5g, pocophone f2 5g, oppo reno 5g....