Honeywell DOLPHIN 99EX - Manual (Page 116)

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Security
The Security screen provides access to establish or
change your security PIN. Check the box next to,
“Require a PIN when the phone is used” to enable the
PIN security feature.
Services
For each service, the phone reads settings from the
network stored on the SIM card and then displays the
available options from the carrier on the screen. To
customize the settings, select it from the list and tap
“Get Settings”.