以下代码:CTTelephonyNetworkInfo*info=[[CTTelephonyNetworkInfoalloc]init];info.subscriberCellularProviderDidUpdateNotifier=^(CTCarrier*carrier){dispatch_async(dispatch_get_main_queue(),^{NSLog(@"UserdidchangeSIM");});};内部:-(BOOL)application:(UIApplication*)applicationdidFinishLaunchingWithOptions:(NS