How to Send SMS using HTTP API in iOS Code?

//Create Objects
NSMutableData * responseData;
NSURLConnection * connection;

// In your viewDidLoad method add this lines
-(void)viewDidLoad
{
    [super viewDidLoad]; 
    //Your username
    NSString * user = @"UR_USER";
    //Your authentication key
    NSString * authkey = @"UR_KEY";
    //Multiple mobiles numbers separated by comma
    NSString * mobiles = @"9974984500"; 
    //Sender ID,While using route4 sender id should be 6 characters long.
    NSString * senderId = @"SENDER";
    //Your message to send, Add URL encoding here.
    NSString * message = @"Test Message";
    //define route
    NSString * route = @"1";
    
    // Prepare your url to send sms with this parameters.
    NSString * url = [[NSString stringWithFormat:@"http://temp.91bulksms.comsubmitsms.jsp?user=%@&authkey=%@&mobiles=%@&message=%@&sender=%@&route=%@", user, key, mobile, message, senderid, accusage] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSURLRequest * request = [NSURLRequest requestWithURL:[NSURL URLWithString:url]];
    connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
}

// implement URLConnection Delegate Methods as follow
-(void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
	//Get response data
    responseData = [NSMutableData data];
} 

-(void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
	[responseData appendData:data];
}

-(void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:error.localizedDescription delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
    [alert show];
}

-(void) connectionDidFinishLoading:(NSURLConnection *)connection
{
    // Get response data in NSString.
    NSString * responceStr = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
}