Use APKPure App
Get Network Switch(3g/4g) old version APK for Android
Ever struggled with an unstable 4G connection? You're at the right place!
This widget app takes you directly to the phone's radio service settings menu, from where you can choose from over 20 network modes including (4G only, 3G only, 2G only, 4G/3G auto switch) and much more you never knew your phone had in it.
-Install the app
-Add widget to the home screen
-Enjoy!