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How does Huawei Mate9 turn on call waiting?
Unicom users can open the "call waiting" function in the following ways:
1. Log in to the mobile phone business hall APP: Click on Service to open Call Settings and Call Waiting;
2. Log in to the online business hall: click Business Handling Basic Business Call Waiting for business handling;
3. Dial *43# on the mobile phone to activate the call waiting function.
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