Call Waiting
If you are already on a phone call, Call Waiting allows you to see details of another incoming call.
You can choose to:
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End your current call and answer the second
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Put your first caller on hold while you answer the second, then return to your first caller again
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Answer the second call and switch between both callers
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Reject the second caller
To activate call waiting dial *43#.
To deactivate call waiting dial #43#.