我们可以检测到SIM卡是否已经使用iOS进行预付费或后付费？

我们可以以任何方式使用网络信息来区分前置和后端？

- (NSDictionary *)fetchSSIDinformation { 
       NSArray *interfaceNames = CFBridgingrelease(CNcopySupportedInterfaces());
       NSLog(@"%s: Supported interfaces: %@",func,interfaceNames);
       NSDictionary *SSIDInfo; 
       for (Nsstring *interfaceName in interfaceNames)
          { 
            SSIDInfo = CFBridgingrelease( CNcopyCurrentNetworkInfo((bridge CFStringRef)interfaceName)); 
            NSLog(@"%s: %@ => %@",__func,interfaceName,SSIDInfo); 
            BOOL isNotEmpty = (SSIDInfo.count > 0); 
            if (isNotEmpty) { break; } 
          }

      return SSIDInfo;
}