Phone number validation

String.swift

    
    static func isValidTelephone(value: String) -> Bool {
        
        if let detector = NSDataDetector(types: NSTextCheckingType.PhoneNumber.rawValue, error: nil) {
            let range = NSRange(location: 0, length: NSString(string: value).length);
            let matches = detector.matchesInString(value, options: NSMatchingOptions.allZeros, range: range);
            for match in matches {
                if let matchType = match as? NSTextCheckingResult {
                    if matchType.resultType == NSTextCheckingType.PhoneNumber {
                        return true;
                    }
                }
            }
        }
        
        return false;
    }