How to change my gt into a 2G network?

The steps of changing a real gt into a 2G network take the real gt, Android11.1.3 system as an example, as follows:

1, light up the mobile phone desktop, find the setting function option on the mobile phone desktop, and click Open, as shown below.

2. Find the mobile network function option, and click to enter the next step, as shown below.

3. Find the preferred network type option, and then click Open Next, as shown below.

4. Click to open the preferred network type of SIM card 1 and select the 4G option, as shown below.

5. Find the OK option and click to switch to the 4G network, as shown below.