Where is the Sony xz mobile phone network set?

Network Settings is to open the data network and open it in Settings:

1, mobile and Unicom models:

Go to phone settings-general-mobile network-preferred network type.

Select 4G/3G/2G or 3g/2g;

2. Telecommunication system model:

Go to Settings-General-Mobile Network-Turn on or off the data switch supporting 4G.

(If 4G is turned off, the mobile phone will use 3G/2G network. )