1.Open the Dialer app on your phone.

2. Dial *#*#4636#*#*, and the phone should automatically redirect you to a hidden “Testing” menu.

3.Here, click on Phone information.

4.Scroll down and tap the drop-down menu under Set preferred network type.

5.Scroll through the available options and choose NR Only  (i.e., 5G Only)

To switch back the settings, repeat the process and select “ NR/ LTE/ TDSCDMA/ CDMA/ EvDo/ GSM/ WCDMA ” from the dropdown menu. Your phone will now automatically select the supported networks.