Google libphonenumber to validate phone number of all regions across the world

Google libphonenumber to validate phone number of all regions across the world
Google has provided a jar libphonenumber.jar using which any number across the world from any country can be validated.

You can download the jar from this location - https://code.google.com/p/libphonenumber/
User interface for testing purpose - http://libphonenumber.appspot.com/
Specify any phone number and you will recieve all the details of the phone number
Functionality provided:
1) Parsing/formatting/validating phone numbers for all countries/regions of the world.
2) getRegionCodeForNumber() method gives the country of the provided phone number
3) isValidNumber - full validation of a phone number for a region using length and prefix information.

Sample implementation is shown below

 package test;  
 import com.google.i18n.phonenumbers.NumberParseException;  
 import com.google.i18n.phonenumbers.PhoneNumberUtil;  
 import com.google.i18n.phonenumbers.Phonenumber.PhoneNumber;  
 public class ValidatePhoneNumber {  
      public static void main(String args[]) {  
           String number = "+91XXXXXXX";  
           PhoneNumberUtil phoneUtil = PhoneNumberUtil.getInstance();  
           try {  
                PhoneNumber numberProto = phoneUtil.parse(number, "");  
                System.out.println("Number is of region - "  
                          + phoneUtil.getRegionCodeForNumber(numberProto));  
                System.out  
                          .println("Is the input number valid - "  
                                    + (phoneUtil.isValidNumber(numberProto) == true ? "Yes"  
                                              : "No"));  
           } catch (NumberParseException e) {  
                System.err.println("NumberParseException was thrown: "  
                          + e.toString());  
           }  
      }  
 }  

Output is for number +91XXXXXX

Number is of region - IN
Is the input number valid - Yes

For invalid number 91XXXXXX

NumberParseException was thrown: Error type: INVALID_COUNTRY_CODE. Missing or invalid default region.