User manual

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 During a call, tap to add calls. Then go back to the current call,
dial another number, and Tap "Merge Calls".
 During a conference call, you can choose to talk to a specific number
or hang up a number.
Use Other Apps During a Call
You can also use other apps when you're answering a call.
 During an ongoing call, go to the Home screen and open other apps.
 Tap the icon at the top of the screen to return to the call.
Call Recording
When you use ColorOS 7.1, you can record a call if you need to keep the
audio recordings.
Call Recording
If you need to record a call, tap before or during a call.
After initiating the call, Tap and the button will be switched to
"Recording Standby" in green color.
Auto Recording
You can also set auto-recording rather than record calls manually.
 Go to [Call] > [Settings] < [Call Recording].