How to set the telephone number for voice reporting of incoming calls?

Take OPPO R9 mobile phone as an example, the setting method is as follows:

First, find the "Settings" icon on the phone desktop, and click Enter.

Second, after entering, find "Voice Assistant" and click Enter.

Third, after entering, find the "voice broadcast" and turn it on, so that when there is an incoming call, the system will voice out the phone number; If you no longer need to broadcast the calling number by voice, just turn off the voice broadcast switch.