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How to set call waiting for Huawei p 10 mobile phone?

Unicom users can open the "call waiting" function in the following ways:

1. Log in to the mobile phone business hall APP: click Services > Handling > Call Settings > Call Waiting > Open;

2. log in to the online business hall: click business processing > basic business > call waiting > business processing;

3. Dial *43# on the mobile phone to activate the call waiting function.