extract the country code from mobile number

Question

I have a list of mobile numbers with country code like "919638095998"number. I have referred the libphonenumber google example also but in that first we need to pass the country 2 digit code, which I don't know initially. So how can I know that the number is from which country?

I have also got one solution as manually extract the code one by one digit from mobile number and then compare with country code. But it is a long task and also it will give me bad performance. Can anyone suggest a proper solution?

Answer 1

libphonenumber does that for you. All you have to do is add the + sign before your phone number and omit the country code when parsing the phone number.

String numberStr = "+919638095998";
PhoneNumberUtil phoneUtil = PhoneNumberUtil.getInstance();
try {
    Phonenumber.PhoneNumber numberProto = phoneUtil.parse(numberStr, "");

    System.out.println("Country code: " + numberProto.getCountryCode());
    //This prints "Country code: 91"
} catch (NumberParseException e) {
    System.err.println("NumberParseException was thrown: " + e.toString());
}