Use APKPure App
Get 4G LTE Only Network Pro old version APK for Android
Working on android 11, android 12, android 13
You can now change network mode of your mobile manually as you want.
There are many network modes which are hidden by the manufacture.
Such as
LTE only (4G only)
WCDMA only
GSM only ... etc
With this application, now you can access those modes.
What you have to do is only open the app