From the Home screen, swipe up, then tap Settings. Tap Wi-Fi & network > SIM & network > Preferred network type. Select from the following: 5G on (Automatic 5G/LTE/3G/2G)
From the Home screen, swipe up, then tap Settings. Tap Wi-Fi & network > SIM & network > Preferred network type. Select from the following: 5G on (Automatic 5G/LTE/3G/2G)