Nokia E71 - Manual (Page 40)

To check the status of voice call restrictions, select the
restriction option and Options > Check status .
To stop all voice call restrictions, select a restriction option
and Options > Cancel all restrict. .
To change the password used for restricting voice, fax, and
data calls, select Options > Edit restriction passwd. . Enter
the current code, then the new code twice. The restriction
password must be four digits long. For details, contact your
service provider.
Restrict net calls
Select Menu > Tools > Settings > Phone > Cal l
restriction > Internet call restriction .
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To decline net calls from anonymous callers, select
Anonymous call barring > On .