使用 CoreTelephony 框架获取当前网络运营商

//
//  MobileCountryCode.h
//
//  http://en.wikipedia.org/wiki/Mobile_Network_Code
//
//  Created by YouXian on 14-3-24.
//  Copyright (c) 2014年 YouXian. All rights reserved.
//

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

#warning 使用前请引入 CoreTelephony.framework 框架

@interface MobileCountryCode : NSObject

/**
 获取当前运营商的标识符
 
 @return 返回运营商标示符(成功返回标示符,失败返回nil)
 
 中国移动 00 02 07
 中国联通 01 06
 中国电信 03 05
 中国铁通 20
 
 */
+ (NSString *)serviceProvider;

@end

//
//  MobileCountryCode.m
//
//  http://en.wikipedia.org/wiki/Mobile_Network_Code
//
//  Created by YouXian on 14-3-24.
//  Copyright (c) 2014年 YouXian. All rights reserved.
//

#import "MobileCountryCode.h"

#if __has_feature(objc_arc)
#define YX_release(obj)
#define YX_autorelease(obj)
#else
#define YX_release(obj)      [obj release]
#define YX_autorelease(obj)  [obj autorelease]
#endif

@implementation MobileCountryCode

+ (NSString *)serviceProvider
{
    CTTelephonyNetworkInfo *info = [[CTTelephonyNetworkInfo alloc] init];
    
    // information about the user’s home cellular service provider
    CTCarrier *carrier = [info subscriberCellularProvider];
    if (carrier == nil)
    {
        YX_release(carrier);
        carrier = nil;
        
        return nil;
    }
    
    // The mobile network code (MNC) for the user’s cellular service provider
    NSString *code = [carrier mobileNetworkCode];
    if (code == nil)
    {
        YX_release(carrier);
        carrier = nil;

        return nil;
    }
    
    return code;
}

@end