Programmatically calling to a phone number from iPhone.

//  This method will call a phone number from string.
+ (void)callPhoneNumber:(NSString *)phoneNumberString
{
        if ([phoneNumberString length]>0)
        {
            phoneNumberString = [[phoneNumberString componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] componentsJoinedByString: @""];
            NSString *phoneDecender = @"tel:";
            NSString *totalPhoneNumberString = [phoneDecender stringByAppendingString:phoneNumberString];
            NSURL *aPhoneNumberURL = [NSURL URLWithString:totalPhoneNumberString];
       
            if ([[UIApplication sharedApplication] canOpenURL:aPhoneNumberURL])
            {
                    [[UIApplication sharedApplication] openURL:aPhoneNumberURL];
            }
       
        }
}