Samsung SCH-A530ZSVXAR - Manual (Page 40)

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To activate call block:
1. Press .
2. Enter the phone number and press .
Note: To block your number permanently, contact your service provider.
Three way calling
To place a three way call:
1. Call the first party, and press . When connected, ask them to remain
on the line, press and they will be placed on hold.
2. Call the second phone number, and press .
3. When the second party answers, press and all parties will be
connected.
Note: You may need to contact your service carrier to set up Call waiting,
Caller I.D., and Three way calling.