Proximus Forum 500 User Manual page 29

Softkeys and Other Keys
Telephoning starting on page 28 chapter.) The local telephone book,
however, is accessible as the lock only affects the functionality of the
communications system.
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If the system administrator has authorised you, you can set the time group
of the communications system (see also "Central settings" Menu starting
on page 90). If your user group authorisation changes according to the
time group, then it is possible that the interface lock of your telephone will
be cancelled.
Please consult your system administrator if you have questions concerning
your authorisation.
Your Telephone's Features
27