Вы можете получить это так:
- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
{
NSString *tokenStr = [[deviceToken description] substringWithRange:NSMakeRange(1, 71)];
NSString *result=[tokenStr stringByReplacingOccurrencesOfString:@" " withString:@""];
NSLog(@"deviceToken result:%@",result);
}