How to retrieve Carrier information ?

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

CTCarrier* carrierObject = [telephonyNetworkInfo subscriberCellularProvider];

string = [[NSString alloc] initWithFormat:@"Allow VoIP: %d\nCarrier Name: %@\nISO Country Code: %@\nMobile Country Code: %@\nMobile Network Code: %@", carrierObject.allowsVOIP, carrierObject.carrierName, carrierObject.isoCountryCode, carrierObject.mobileCountryCode, carrierObject.mobileNetworkCode];

NSLog(@"%Carrier information: \n%@", string);

(Original Sources: http://www.jesuisdeveloppeuriphone.com/2012/08/24/coretelephony-how-to-retrieve-carrier-information/)