If the codes don't work, you can find the settings buried in your Phone app.
There are three primary methods to disable this feature. call barring disable
If you cannot find the setting in your phone’s menu, you can use "Man-Machine Interface" (MMI) codes. These are typed directly into your dialer pad and work on almost any GSM network globally. If the codes don't work, you can find
Modern smartphones often have a graphical interface for these settings. These are typed directly into your dialer pad
October 26, 2023 Subject: Procedures and Troubleshooting for Disabling Call Barring on Mobile Devices Prepared For: Technical Support Department / End-User Documentation
Also, ensure that Silence Unknown Callers is turned off if you are missing calls from people not in your contacts. Using Network Shortcodes (Universal Method)
Call barring is distinct from "Do Not Disturb" or "Call Blocking."