Currently available frequency bands for 5G include FR1 (450MHz-6000MHz) and FR2 (24250MHz-52600MHz)
5G turn on method:
realme UI 7.0 & 6.0 & 5.0 & 4.0 & 3.0: Settings > Mobile network > Select SIM card > Preferred network type > select 5G
realme UI 2.0 & 1.0: Settings > SIM card & mobile data > Preferred network type > select 5G
Related Articles: