Sagem myX-8 - Manual (Page 68)

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Settings
Call waiting (Operator-dependent service)
During a call, you may be informed that a caller is trying to reach you: you
hear a special tone. The caller's identity is displayed on the screen (name or
number).
On the Calls menu, please select the Call waiting menu and [Select].
You can activate, deactivate, or consult the status of the call waiting
service in order to check if it is active or not.
During a call, if a second caller tries to contact you, the screen displays the
call warning.
Automatic redial This menu allows you to call back a caller you have not managed to reach.
On the Calls menu, please select the Auto redial menu and [Select].
You can set the redial function to inactive, on request or systematic.
If you choose On demand, your phone will offer to redial your caller
automatically if his number is busy.