Samsung PM-A840 Owner's Manual page 104

To place roaming calls with Call Guard on:
1.
From standby mode, dial 1 + area code + the seven-
digit number and press
2.
Press
To answer incoming roaming calls with Call Guard on:
1.
Press
2.
Press
Reminder:
92 Section 2D: Controlling Your Roaming Experience
to confirm Roaming Rate.
to confirm Roaming Rate.
If the Call Guard feature is set to On, you need to
take extra steps to make and receive roaming calls.
.