CTTelephonyNetworkInfo* telephonyNetworkInfo = [[CTTelephonyNetworkInfo alloc] init];
CTCarrier* carrierObject = [telephonyNetworkInfo subscriberCellularProvider];
string = [[NSString alloc] initWithFormat:@"Allow VoIP: %dnCarrier 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);
(Fontes originais: http://www.jesuisdeveloppeuriphone.com/2012/08/24/coretelephony-how-to-retrieve-carrier-information/ )