libphonenumber是Google的公共Java、C++和Javascript庫用來解析，格式化，存儲和驗證國際電話號碼。 其中Java版本優化用于運行在智能手機上，并且用在了 Android framework 4.0 (Ice Cream Sandwich)以上的版本中。

功能亮點：

• Parsing/formatting/validating phone numbers for all countries/regions of the world.
• getNumberType - gets the type of the number based on the number itself; able to distinguish Fixed-line, Mobile, Toll-free, Premium Rate, Shared Cost, VoIP and Personal Numbers (whenever feasible).
• isNumberMatch - gets a confidence level on whether two numbers could be the same.
• getExampleNumber/getExampleNumberByType - provides valid example numbers for all countries/regions, with the option of specifying which type of example phone number is needed.
• isPossibleNumber - quickly guessing whether a number is a possible phonenumber by using only the length information, much faster than a full validation.
• isValidNumber - full validation of a phone number for a region using length and prefix information.
• AsYouTypeFormatter - formats phone numbers on-the-fly when users enter each digit.
• findNumbers - finds numbers in text input.
• PhoneNumberOfflineGeocoder - provides geographical information related to a phone number.
• PhoneNumberToCarrierMapper - provides carrier information related to a phone number.
</ul>

String swissNumberStr = "044 668 18 00"
PhoneNumberUtil phoneUtil = PhoneNumberUtil.getInstance();
try {
  PhoneNumber swissNumberProto = phoneUtil.parse(swissNumberStr, "CH");
} catch (NumberParseException e) {
  System.err.println("NumberParseException was thrown: " + e.toString());
}

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