Samsung SCH-R220ZSADYN - Manual (Page 35)

Section 2
Section 2
Placing And Receiving Calls 59 58 Placing And Receiving Calls
This section only applies if you have enabled Call Waiting. The feature is
not automatically enabled, but is available for free if you are interested
in using it. To enable Call Waiting, please call us at
1-800-733-6632.