Here's how you'd create an HTTP POST request with NSURLConnection to post the fields "text", "mail", and "phone":
NSURLRequest *req = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://www.myserver.com/page.php"]];
NSMutableString *postBody = [NSMutableString stringWithFormat:@"text=%@", [@"very long text" stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
[postBody appendFormat:@"&mail=%@", [@"[email protected]" stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
[postBody appendFormat:@"&phone=%@", [@"1231231234" stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
[req setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"content-type"];
[req setHTTPBody:[body dataUsingEncoding:NSUTF8StringEncoding]];
[req setHTTPMethod:@"POST"];
NSURLConnection *conn = [NSURLConnection connectionWithRequest:req delegate:self];
// Now, implement NSURLConnection delegate methods such as connectionDidFinishLoading: and connection:didFailWithError: to do something with the response from the server.