Green analog public phones:just press the emergency button andplace your call (international phone calls an exception)
Digital public phones: just pick up the phone and dial
How to use Emergency Dial 171
To leave a message:
1. dial 171
2. press 1
3. press your phone number
4. record your message
To check for messages:
1. dial 171
2. press 2
3. press the number of the person you want to check up on
4. listen to their recording