you are using a region customized phone. is calling functions are restricted in your region & Its calling functions will be restricted in your region please contact realme customer service. if you face after buing new phone or bought from abroad. then you are in rigth place to fix and unlock your phone. here in this post some different method to fix your phone

Realme 14X 5G RMX3940 Region Unlock
Why Get Face Network Region Lock On New Phone ?
“Network lock” You are using a region customized phone. Its communication function is restricted in current region. Please contact Realme customer Service, Thats mean it’s Network Locked, Network lock will be triggered if you are using a device that is not a local version sold in the current country/region, which means that the phone cannot make calls, send text messages, or register with the network. This will not affect the normal use of other functions. Also, since the software and hardware of different regional versions of the phone may differ. If you have lived abroad for a long time to ensure a good user experience, we recommend you purchase the local version of the realme phone in your country/region.

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