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When call waiting is turned on, you can hear and answer a new incoming call while you have an ongoing call. Follow these instructions to turn call waiting on or off.
Find "Call waiting"
Scroll to Settings and press OK.
Scroll to Applications and press OK.
Scroll to Call and press OK.
Scroll to Voice calls and press OK.
Scroll to Call waiting and press OK.
Turn call waiting on or off
Highlight Activate or Deactivate and press OK.
Press Disconnect to return to standby mode.