Use APKPure App
Get Switch Network Type 2G / 3G old version APK for Android
Belanja Google Play di web. Beli dan nikmati langsung di ponsel atau tablet Android Anda tanpa perlu sinkronisasi.
This app/shortcut opens directly the settings app of mobile network settings to switch between "2G" and "allow 3G" networks (e.g. to save battery). A direct switch is sadly not possible.
It places also a shortcut in the statusbar to reach the settings from everywhere.