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When call waiting is turned on, you can hear and answer a new incoming call while you're on the phone. Follow these instructions to turn call waiting on or off.
If you're a Pay as you go customer, you can activate call waiting and hear when you have a second call. You can only answer the new call, however, if you end the ongoing call.
Find "Call Waiting"
Turn call waiting on or off
Scroll to Enabled and press the Navigation key to turn call waiting on or off.