/*
 * CTSubscriberTokenRefreshed
 *
 * Description:
 *     The name of the NSNotification sent when the carrier token is available.
 */
CORETELEPHONY_EXTERN NSString * const CTSubscriberTokenRefreshed  __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_7_0);

CORETELEPHONY_CLASS_AVAILABLE(7_0)
@interface CTSubscriber : NSObject

/*
 * carrierToken
 *
 * Description:
 *     A data blob containing authorization information about the subscriber.
 *
 *     May return nil if no token is available.
 */
@property (nonatomic,readonly,retain) NSData* carrierToken  __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_7_0);

@end

此外,在What’s new on iOS 7,这是提到：

The Core Telephony framework (CoreTelephony.framework) lets you get information about the type of radio technology in use by the device. Apps developed in conjunction with a carrier can also authenticate against a particular subscriber for that carrier.

我认为CTSubscriber与文本的大胆部分有关.但是,我没有发现任何与此有关的事情.

我尝试使用以下代码(添加到应用程序：didFinishLaunchingWithOptions :)来试验此API,但通知永远不会被触发,并且carrierToken返回nil：

CTSubscriber *subscriber =  [CTSubscriberInfo subscriber];
NSLog(@"%@",subscriber.carrierToken);

[[NSNotificationCenter defaultCenter] addObserverForName:CTSubscriberTokenRefreshed object:nil queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification *note) {
    NSLog(@"==========");
    NSLog(@"%@",note);
    NSLog(@"%@",subscriber.carrierToken);
}];

所以,我有以下问题：

>究竟什么(“授权信息”)carrierToken返回以及如何使它不是零？
> Apple如何知道您的应用是“与操作符共同开发”的？
>这是Evernote如何向Telefonica用户提供1年的高级帐户(http://blog.evernote.com/blog/2013/08/13/evernote-and-telefonica-announce-global-partnership/)？ (可能不是,因为他们需要的信息可以在CTCarrier上获得)