IPhone : iOS - customize class method in a singleton

I am customizing my singleton class of CLLocationManager.

I have

@property (nonatomic, strong) CLLocationManager *sManager;

and

static MyLocationManager* sMyLocationManager=nil;

+(instancetype)sharedLocationManager{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sMyLocationManager = [[self alloc] init];

    });
    return sMyLocationManager;

}

I could able to write my own methods as

-(void)settingUserLocationManager{
    if(nil== sMyLocationManager.sManager){
        sMyLocationManager.sManager = [[CLLocationManager alloc] init];
}
-(void)onStartUpdatingUserLocation{
    [sMyLocationManager.sManager startUpdatingLocation];
    return;
}
-(void)onStopUpdatingUserLocation{
    [sMyLocationManager.sManager stopUpdatingLocation];
}

startUpdatingLocation and stopUpdatingLocation are instance methods and this how I use them, while [CLLocationManager locationServicesEnabled] is a class method. I have no idea how to use that in my singleton class.

I have tries using it as

+(BOOL)locationServicesEnabled {
    return [sMyLocationManager.sManager locationServicesEnabled];
}

but not working as expected. Kindly add some ideas.