I have the following code:
phoneNumber = (NSString*)CFBridgingRelease(ABMultiValueCopyValueAtIndex(phones, i));
NSString *phoneNumberURLString = [[NSString alloc] initWithFormat:@"tel://%@", phoneNumber];
NSURL *phoneURL = [[NSURL alloc] initWithString:phoneNumberURLString];
[[UIApplication sharedApplication] openURL:phoneURL];
However, the issue with this is that, sometimes a certain phone number doesn't get called: for example if phoneNumber is (520) 123-1232, then this doesn't call the phone. Any idea on how to standarize the phone number format such that this method works for all cases?