I got it working! You need to compile the libphonenumber library with your code using the closure compiler http://closure-compiler.appspot.com/:
// ==ClosureCompiler==
// @output_file_name default.js
// @compilation_level ADVANCED_OPTIMIZATIONS
// @use_closure_library true
// @code_url http://libphonenumber.googlecode.com/svn/trunk/javascript/i18n/phonenumbers/phonemetadata.pb.js
// @code_url http://libphonenumber.googlecode.com/svn/trunk/javascript/i18n/phonenumbers/phonenumber.pb.js
// @code_url http://libphonenumber.googlecode.com/svn/trunk/javascript/i18n/phonenumbers/metadatalite.js
// @code_url http://libphonenumber.googlecode.com/svn/trunk/javascript/i18n/phonenumbers/phonenumberutil.js
// @code_url http://libphonenumber.googlecode.com/svn/trunk/javascript/i18n/phonenumbers/asyoutypeformatter.js
// ==/ClosureCompiler==
function buildAndValidatePhone(phoneNumber, countryCode) {
var strIntlNumber = "invalid";
try {
var phoneUtil = i18n.phonenumbers.PhoneNumberUtil.getInstance();
var regionCode = phoneUtil.getRegionCodeForCountryCode(countryCode);
var number = phoneUtil.parseAndKeepRawInput(phoneNumber, regionCode);
if (phoneUtil.isValidNumber(number)) {
var PNT = i18n.phonenumbers.PhoneNumberType;
var numberType = phoneUtil.getNumberType(number);
if (numberType == PNT.MOBILE) {
var PNF = i18n.phonenumbers.PhoneNumberFormat;
strIntlNumber = phoneUtil.format(number, PNF.E164);
strIntlNumber = strIntlNumber.replace('+','');
}
}
}
catch(ex) {
console.log(ex);
}
return strIntlNumber;
};