using PhoneNumbers;

using System;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var numbers = @"

+44(0)2012341234

+44 (0)20 1234-1234

+9999 1234

020 1234-1234

invalid phone num

+36204478247

003612554578

";

​

        PhoneNumberUtil phoneUtil = PhoneNumberUtil.GetInstance();

        Console.WriteLine($"{"Original",-30}{"International",-30}{"Local",-30}");

        foreach (var numtxt in numbers.Split(Environment.NewLine).Where(n => !string.IsNullOrWhiteSpace(n)))

        {

            try

            {

                PhoneNumber num = phoneUtil.Parse(numtxt, "UK");

                Console.WriteLine($"{numtxt,-30}{phoneUtil.Format(num, PhoneNumberFormat.INTERNATIONAL),-30}{phoneUtil.Format(num, PhoneNumberFormat.NATIONAL),-30}");

            }

            catch (NumberParseException)

            {

                Console.WriteLine($"{numtxt,-30}{"Invalid",-30}{"Invalid",-30}");

            }

        }

    }

}