how to call a number when you click it same as iphone phonebook?

I want to call a number when click that number(UIButton), just as in iphone phoneboo开发者_StackOverflow中文版k?

NSURL *telURL = [NSURL URLWithString:@"tel:1-234-567-8901"];
[[UIApplication sharedApplication] openURL:telURL];

Example:

[[UIApplication application] openURL:[NSURL URLWithString:@"tel://99887766"]];

Add it to the IBAction.

- (IBAction)buttonClicked
{
NSURL *telURL = [NSURL URLWithString:@"tel:urNumber"];
[[UIApplication sharedApplication] openURL:telURL];

}