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On Android settings, under Wireless controls->Mobile networks there is a setting “Use only 2G networks”.
In the Android SDK reference, under android.telephony.TelephonyManager, there doesn’t seem to be anything to control the network type.
What APIs does this setting actually call?
It appears to call
com.android.internal.telephony.Phone.setPreferredNetworkType(). Since it is “internal”, it isn’t available to applications via the SDK.See:
https://android.googlesource.com/platform/packages/apps/Phone/+/master/src/com/android/phone/Use2GOnlyCheckBoxPreference.java