- (IBAction)switchingCallConfirmation:(UISwitch *)sender {
    NSUserDefaults *uDefaults = [NSUserDefaults standardUserDefaults];
    if (sender.tag == 0) {
        if (sender.on == 1) {
            [uDefaults setObject:@"On" forKey:@"Call Confirmation"];
             NSLog(@"switched on");
        }
        else if (sender.on == 0) {
            [uDefaults setObject:@"Off" forKey:@"Call Confirmation"];
            NSLog(@"switched off");
        }
    }
    [uDefaults synchronize];
}