Is Phone Number Valid

- (BOOL)isPhoneValid:(NSString *)phone
{
    NSCharacterSet *phoneSet = [NSCharacterSet characterSetWithCharactersInString:@"-+0123456789()"];
    return [[phone stringByTrimmingCharactersInSet:phoneSet] isEqualToString:@""];
}

- (BOOL)isPhoneNumberValid:(NSString *)phone
{
    NSError *error;
    NSDataDetector *detector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypePhoneNumber error:&error];
    
    NSRange range = NSMakeRange(0, [phone length]);
    NSArray *matches = [detector matchesInString:phone options:0 range:range];
    if ([matches count] == 0) {
        return NO;
    }
    
    NSTextCheckingResult *result = (NSTextCheckingResult *)[matches firstObject];
    return ([result resultType] == NSTextCheckingTypePhoneNumber && result.range.location == range.location && result.range.length == range.length);
}