CTTelephonyNetworkInfo

CarrierObserver.h

#import <CoreTelephony/CTCarrier.h>
#import <CoreTelephony/CTTelephonyNetworkInfo.h>

@class CTCarrier;

@interface ANCarrierMeta: NSObject
@property (nonatomic, copy, readonly) NSString *name;
@property (nonatomic, copy, readonly) NSString *countryCode;
@property (nonatomic, copy, readonly) NSString *networkCode;
- (instancetype)initWith:(NSString *)name
             countryCode:(NSString *)countryCode
             networkCode:(NSString *)networkCode;

+ (instancetype)makeWithCarrier:(CTCarrier *)carrier;;
@end

@interface ANCarrierObserver: NSObject
@property (nonatomic, strong, nullable, readonly) ANCarrierMeta *carrierMeta;
+ (instancetype)shared;
@end

CarrierObserver.m

@interface ANCarrierObserver()
@property (nonatomic, strong, nullable, readwrite) ANCarrierMeta *carrierMeta;
@property (nonatomic, strong) CTTelephonyNetworkInfo *networkInfo;
@end

@interface ANCarrierMeta()
@property (nonatomic, copy, readwrite) NSString *name;
@property (nonatomic, copy, readwrite) NSString *countryCode;
@property (nonatomic, copy, readwrite) NSString *networkCode;
@end

@implementation ANCarrierMeta
- (instancetype)initWith:(NSString *)name
             countryCode:(NSString *)countryCode
             networkCode:(NSString *)networkCode;
{
    if (self = [super init]) {
        self.name = name;
        self.countryCode = countryCode;
        self.networkCode = networkCode;
    }
    return self;
}

+ (instancetype)makeWithCarrier:(CTCarrier *)carrier {
    return [[ANCarrierMeta alloc] initWith:carrier.carrierName
                             countryCode:carrier.mobileCountryCode
                             networkCode:carrier.mobileNetworkCode];
}
@end

@implementation ANCarrierObserver
+ (instancetype)shared {
    static ANCarrierObserver *sharedInstance = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedInstance = [[ANCarrierObserver alloc] init];
        // Do any other initialisation stuff here
    });
    return sharedInstance;
}

- (instancetype)init
{
    self = [super init];
    if (self) {
        self.networkInfo = [CTTelephonyNetworkInfo new];
        __weak typeof(self) weakSelf = self;
        self.networkInfo.subscriberCellularProviderDidUpdateNotifier = ^(CTCarrier *carrier) {
            if (!weakSelf) { return; }
            __strong typeof(weakSelf) strongSelf = weakSelf;
            ANCarrierMeta *newCarrierMeta = [ANCarrierMeta makeWithCarrier:carrier];
            dispatch_async(dispatch_get_main_queue(), ^{
                strongSelf.carrierMeta = newCarrierMeta;
            });
        };
        CTCarrier *carrier = [self.networkInfo subscriberCellularProvider];
        self.carrierMeta = [ANCarrierMeta makeWithCarrier:carrier];
        
    }
    return self;
}
@end