Checks validation of a given phone number

ValidPhoneNumber.m

- (BOOL)isValidPhoneNumber:(NSString *)phoneNumberString {
    
    NSError *error = nil;
    
    NBPhoneNumber *phoneNumber = [self.util parse:phoneNumberString defaultRegion:self.region error:&error];
    
    if (error) {
        return NO;
    } else {
        return [self.util isValidNumber:phoneNumber];
    }
    
}