问题
I am on the 6.0.1 Marshmallow OS and my previous commands to change the preferred network mode are no longer working.
Commands used in Kit Kat worked without issue:
adb shell sqlite3 /data/data/com.android.providers.settings/databases/settings.db "SELECT * FROM global WHERE name='preferred_network_mode'"
adb shell sqlite3 /data/data/com.android.providers.settings/databases/settings.db "update global SET value=1 WHERE name='preferred_network_mode'"
adb shell sqlite3 /data/data/com.android.providers.settings/databases/settings.db "select value FROM secure WHERE name='preferred_network_mode'
Commands from above entered in this OS result in output:
Error: no such table: global
I pulled the database file, which was completely empty:
adb pull /data/data/com.android.providers.settings/databases/
Is there any ADB command that I can use to change the preferred_network_mode to LTE/GSM?
回答1:
After a lot of research, this was the working solution I found for Marshmallow.
The Preferred Network Mode numbers are found: https://android.googlesource.com/platform/hardware/ril/+/master/include/telephony/ril.h#228
1 is GSM Only
11 is LTE Only
adb wait-for-devices
adb root
adb wait-for-devices
adb shell settings list global | grep pref
This returned to me both "preferred_network_mode" and "preferred_network_mode1"
adb shell settings put global preferred_network_mode 1
adb shell settings put global preferred_network_mode1 1
adb shell stop ril-daemon
adb shell start ril-daemon
回答2:
For setting RAT on SUB1, run below command:
adb wait-for-devices
adb root
adb wait-for-devices
adb remount
adb shell settings put global preferred_network_mode 1
adb shell settings put global preferred_network_mode1 1
adb shell stop ril-daemon
adb shell start ril-daemon
adb shell settings put global airplane_mode_on 1
adb shell am broadcast -a android.intent.action.AIRPLANE_MODE --ez state true
adb shell sleep 5;
adb shell settings put global airplane_mode_on 0
adb shell am broadcast -a android.intent.action.AIRPLANE_MODE --ez state false
Now, check if RAT is set or not by running below command:
adb shell dumpsys telephony.registry | grep mServiceState
回答3:
adb shell:
content update --uri content://settings/global --bind value:i:12 --where "name='preferred_network_mode'"
12 == LTE + WCDMA, for more see ril.h
dont forget to set preferred_network_mode1 and preferred_network_mode2 and preferred_network_mode3
来源：https://stackoverflow.com/questions/37848059/adb-command-marshmallow-change-preferred-network-mode-lte-gsm