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How to turn on the sos self-service function of mobile phone?
If you use a vivo phone, SOS can be used as follows:

1. Go to Settings-Security and Privacy-Turn on SOS Emergency Call (some models need to go to Settings-More Settings-Security-SOS Emergency Call and turn on SOS Emergency Call);

2. After opening the SOS emergency call, select "Emergency Contact Phone" to fill in the emergency contact;

3. Start mode: Press the power button for 5 times to start quickly.