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Retrieving a country code from a mobile number

I have a list of mobile numbers with a country code, for example "919638095998". I also referred to the libphonenumber google example , but first we need to pass a 2-digit country code, which I do not know initially. So, how can I find out what number is from which country?

I also have one solution that manually extracts the code one digit from a mobile number and then compares the country code. But this is a long task and it will give me poor performance. Can anyone suggest the right solution?

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9 answers

There is a list of all phone numbers available for country codes on Wikipedia. Here

http://en.wikipedia.org/wiki/List_of_country_calling_codes

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Hashmap fourdigitcodes;

//check if first digit is 7
if(firstdigit==7)
  //country definitely russia
else
   if country code begins with 1.
     Check the first four digits are in the hashmap with four digit codes and return the value 
     if no value is found then answer is certainly usa.
otherwise
     String country="";
     HashMap<String,String> ccode = new HashMap<String,String>();
     ccode.put("353","Ireland");//List all country codes
     ccode.put("49","Germany");
     String value = ccode.get("49");//See if I have a value for the first 2 digits
     if(value != null){
      country = value; //If I found a country for the first two digits we are done as the              first two digits of the country code consisting of two digits cannot be in a country code with 3
     }else{
      the country is certainly 3 digit. return the first three digits by entering the first 3 digits as the key of the hashmap countaining the first three digits. 
     }

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+4

Java Javascript, Google;)

. : https://github.com/googlei18n/libphonenumber

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libphonenumber does this for you. All you have to do is add a character +in front of the phone number and skip 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());
}
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The below code will extract the country code from any given phone number, the logic is implemented based on. https://en.wikipedia.org/wiki/List_of_country_calling_codes
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

    /**
     * @author swapna * This class will fetch the country code from the incoming
     *         phone number with format <+><CTRY CODE><Phone Number> based on the
     *         data from https://en.wikipedia.org/wiki/List_of_country_calling_codes
     *
     */
    public enum PhoneNumberNCtryCode {
        Instance;

        private List<Integer> forCtryCodePrefix1 = new ArrayList<Integer>();
        @SuppressWarnings("serial")
        List<Integer> forCtryCodePrefix2 = new ArrayList<Integer>() {
            {
                add(0);
                add(7);
                add(8);

            }
        };
        @SuppressWarnings("serial")
        private List<Integer> forCtryCodePrefix3 = new ArrayList<Integer>() {
            {
                add(0);
                add(1);
                add(2);
                add(3);
                add(4);
                add(6);
                add(9);
            }
        };
        @SuppressWarnings("serial")
        private List<Integer> forCtryCodePrefix4 = new ArrayList<Integer>() {
            {
                add(0);
                add(1);
                add(3);
                add(4);
                add(5);
                add(6);
                add(7);
                add(8);
                add(9);
            }
        };
        @SuppressWarnings("serial")
        private List<Integer> forCtryCodePrefix5 = new ArrayList<Integer>() {
            {
                add(1);
                add(2);
                add(3);
                add(4);
                add(5);
                add(6);
                add(7);
                add(8);
            }
        };
        @SuppressWarnings("serial")
        private List<Integer> forCtryCodePrefix6 = new ArrayList<Integer>() {
            {
                add(0);
                add(1);
                add(3);
                add(4);
                add(5);
                add(6);

            }
        };
        private List<Integer> forCtryCodePrefix7 = new ArrayList<Integer>();
        @SuppressWarnings("serial")
        private List<Integer> forCtryCodePrefix8 = new ArrayList<Integer>() {
            {
                add(1);
                add(3);
                add(4);
                add(6);
                add(9);

            }
        };
        @SuppressWarnings("serial")
        private List<Integer> forCtryCodePrefix9 = new ArrayList<Integer>() {
            {
                add(1);
                add(2);
                add(3);
                add(4);
                add(5);
                add(8);
            }
        };
        @SuppressWarnings("serial")
        private Map<Integer, List<Integer>> countryCodeMap = new HashMap<Integer, List<Integer>>() {
            {
                put(1, forCtryCodePrefix1);
                put(2, forCtryCodePrefix2);
                put(3, forCtryCodePrefix3);
                put(4, forCtryCodePrefix4);
                put(5, forCtryCodePrefix5);
                put(6, forCtryCodePrefix6);
                put(7, forCtryCodePrefix7);
                put(8, forCtryCodePrefix8);
                put(9, forCtryCodePrefix9);

            }
        };

        /**
         * This method parses the phone number using the prefix Ctry Map
         * 
         * @param phoneNumber
         * @return
         */
        public int getCtryCode(String phoneNumber) {
            String ctryCodeAtIndex1 = phoneNumber.substring(1, 2);
            Integer ctryCode = 0;
            String ctryCodeStr = "0";

            List<Integer> ctryCodeList =        countryCodeMap.get(Integer.valueOf(ctryCodeAtIndex1));
            if (ctryCodeList.isEmpty()) {
                ctryCode = Integer.valueOf(ctryCodeAtIndex1);
                return ctryCode.intValue();
            }
            String ctryCodeAtIndex2 = phoneNumber.substring(2, 3);
            for (Integer ctryCodePrefix : ctryCodeList) {
                if (Integer.valueOf(ctryCodeAtIndex2) == ctryCodePrefix) {
                    ctryCodeStr = phoneNumber.substring(1, 3);
                    ctryCode = Integer.valueOf(ctryCodeStr);
                    return ctryCode.intValue();

                }
            }
            ctryCodeStr = phoneNumber.substring(1, 4);
            ctryCode = Integer.valueOf(ctryCodeStr);
            return ctryCode.intValue();
        }

    }
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