LG G8X ThinQ User Manual page 46

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Call Waiting ( )
Call Waiting is activated.
・If Call Waiting is set and a second call arrives during a call,
Call Waiting tone is heard. Drag up to begin call.
Using Group Calling
This service requires separate subscription.
During a call,
Add call
Enter phone number
Call is added.
When the other party answers,
Group Calling starts.
Merge calls