UIApplication not launching to make phone call

I have this code:

NSString *telURL = [NSString stringWithFormat:@"tel:1-%@",((UIButton*) sender).titleLabel.text];
telURL = [telURL stringByReplacingOccurrencesOfString:@"\n" withString:@""];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:telURL]];

But it does not launch the dialer application to make a phone call.

I've checked the string telURL and its contents are : "tel:[REDACTED]", which to my understanding is what it needs to be.

Any ideas?

EDIT: In the event that it matters I've just been running this on the simulator. I won't have a physical device for a few days. (And from the answers 开发者_运维技巧below apparently it does matter)

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You answered your own question. The tel: URL does NOT work on the iPhone simulator AND the iPod Touch (and iPad, of course). It ONLY works on the iPhone.

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That matters. There is no telephone app in the simulator. And trying to open a telephone URL on a device (iPod touch, simulator) that doesn't have the app, just silently fails.

Your formatting is correct though.

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First, just checking you are running on hardware that includes a phone (not iPod touch) and not the simulator right? The simulator won't let you test this.

An easy way to get rid of whitespace in your phone number is:

NSString *phoneURLString = [[self.phoneNumber componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] componentsJoinedByString: @""];

Also you should be programmatically checking if the device (or simulator) can handle the url. Simple way to check that is using canOpenURL:

[[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:yourPhoneNumberStringHere]]