Samsung GH68-12948A - Manual (Page 19)

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To retrieve the call, press and hold the Multi-Function button
again.
Depending on your phone, this feature may not be
supported.
• Answering a second call
When your phone notifies you of another incoming call while
you are on a call, press and hold the Multi-Function button
to answer the second call.
You can switch between calls by pressing and holding it.
Depending on your phone, this feature may not be
supported.