Nokia Lumia 820
Find "Phone"
Slide your finger left on the display.
Press Phone.
Press Phone.
Turn call waiting on or off
Press the keypad icon.
To turn on call waiting.
To turn on call waiting.
Key in *43# and press call.
To turn off call waiting:
Key in #43# and press call.
Key in #43# and press call.
Exit
Press the Home key to return to standby mode.
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