Your administrator must enable this feature for your mobile phone number but you can change that number anytime from your Advanced Call Settings.

1

During a call, tap More and select Switch to <number>.

You receive an incoming call on your mobile Phone app. There will be a short pause in your call while you make the switch, so you may want to give the person you're talking to a heads up.

2

Answer the incoming call on your mobile Phone app and continue with your conversation.

The call in Webex App automatically disconnects.