Samsung Galaxy S4 User Manual page 368

Important! Not all SIM cards use a PIN2 code. If your SIM card does
not, this menu does not display.
The PIN2 code is provided by your carrier. Entering the
PIN2 incorrectly three times will cause the device to lock.
Contact customer service for assistance.
Managing the FDN List
When this feature is enabled, you can make calls only to phone
numbers stored in the FDN list on the SIM card.
1. From the main Call settings page, tap Additional settings
Fixed dialing numbers.
2. Tap Enable FDN.
3. At the prompt, enter your PIN2 code and tap OK.
FDN is enabled.
4. Tap FDN list then press
the contacts that were stored.
Important! Not all SIM cards use a PIN2 code. If your SIM card does
not, this menu does not display.
The PIN2 code is provided by your carrier. Entering the
PIN2 incorrectly three times will cause the device to lock.
Contact customer service for assistance.
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and then tap Add contact or edit