Nokia 22 Operator's Manual page 52

Important!
Restricting calls in some networks may restrict the ability to make
emergency calls. If this is the case in your network, ALL USERS OF
THE TERMINAL MUST BE INFORMED by appropriate warning signs
on ALL phones connected to the terminal.
The effect of call restriction varies among networks so each opera-
tor must provide its own warning signs that accurately describe any
emergency restrictions.
Test the effect of call restriction on calls to your local emergency
number(s) and warn as needed.
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