User manual

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You can make some adjustments regarding audio during answering a
call.
Adjust the volume: Press the volume button on the left side of the
phone.
Mute: Click the
Hold: Click
Speaker: Click
Initiate a Conference Call
Depending on the carrier, you can initiate a conference call with multiple
contacts.
During a call, tap to add calls. Then go back to the current call,
dial another number, and click "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.
Click the icon at the top of the screen to return to the call.
Call Recording