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Getting null values for MCC and MNC in iOS 14.7 above

CTTelephonyNetworkInfo *fetchnetworkInfo = [[CTTelephonyNetworkInfo alloc] init];

    NSDictionary<NSString *, CTCarrier *> *providers= [fetchnetworkInfo serviceSubscriberCellularProviders];

CTCarrier *carrier = providers.allValues.firstObject;
                    
   isoCountryCode = carrier.isoCountryCode;
                    
   mobileNetworkCode = carrier.mobileNetworkCode;
                    
    mobileCountryCode = carrier.mobileCountryCode;

but for iOS 14.7 above I’m getting null values for MNC And MCC please suggest

any solution please.