Push notification not working on real device

I am having an app which works on iOS 7 and later. Push notification was working in development mode last day but not now.

I am registering for push like this

if ([application respondsToSelector:@selector(isRegisteredForRemoteNotifications)])
{
// iOS 8 Notifications
[application registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeSound | UIUserNotificationTypeAlert | UIUserNotificationTypeBadge) categories:nil]];

    //enabled =  [application isRegisteredForRemoteNotifications];
}
else
{
    // iOS < 8 Notifications
    [application registerForRemoteNotificationTypes:
     (UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeSound)];
    //UIRemoteNotificationType types = [application enabledRemoteNotificationTypes];
    //enabled = types & UIRemoteNotificationTypeAlert;

}

// Delegate methods are

  • (void)application:(UIApplication *)application didRegisterUserNotificationSettings:(UIUserNotificationSettings *)notificationSettings
    {
    //register to receive notifications

    [application registerForRemoteNotifications];
    }

  • (void)application:(UIApplication*)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData*)deviceToken
    {

    NSString *newToken = [deviceToken description];

    newToken = [newToken stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"<>"]];

    newToken = [newToken stringByReplacingOccurrencesOfString:@" " withString:@""];

    self.myDeviceToken = newToken;
    [CLServerDataManager setDeviceToken:newToken];

}

  • (void)application:(UIApplication*)application didFailToRegisterForRemoteNotificationsWithError:(NSError*)error
    {

#if TARGET_IPHONE_SIMULATOR
NSLog(@“Failed to get token, error: %@”, error);
[CLServerDataManager setDeviceToken:@“dummy”];
self.myDeviceToken = @“dummy”;
#endif

}

And push was working till last day. and certificates are made with the www.raywenderlich.com site.

But now I have noticed that methods

didRegisterForRemoteNotificationsWithDeviceToken:
didFailToRegisterForRemoteNotificationsWithError
not calling and I am not getting the device token.

I am trying this code for APNS

NSUUID *identifierForVendor = [[UIDevice currentDevice] identifierForVendor];
NSString *deviceId = [identifierForVendor UUIDString];
But both are not working.

please let me know what could be the issue. Thanks in advance