Galaxy S23's: How to Turn On Fix Dialing Numbers (FDN) to Restrict Outgoing Calls

Learn how you can turn on Fix Dialing Numbers (FDN) to restrict outgoing calls on the Samsung Galaxy S23/S23+/Ultra.
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This demonstration is running on Android 13.
The benefit of fixed dialing numbers on a Samsung phone is that it restricts the phone to make calls only to certain pre-defined phone numbers, which can help to control costs and ensure that the phone is only used for authorized purposes. This feature is particularly useful for businesses that provide phones to their employees, as it can prevent unauthorized phone usage, such as making personal calls or calling international numbers. Fixed dialing numbers can also be useful for parents who provide phones to their children, as it can restrict the child's phone usage to a limited set of contacts. By setting up fixed dialing numbers on a Samsung phone, you can have greater control over the phone usage and avoid any unexpected or excessive phone bills.
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[@gotflute123]

The pin "works" but it shows "FDN operation failed": is this a phone problem, or something the carrier might be blocking?

[@Ibrahimmmee]

My samsung s23 has different number format like for portugal it is "XXX XXX XXX" but it shows as XXXXXXXXX. Numbers don't have spaces.
How can I fix this? Please help