A free API for global phone number validation based on personal name and phone number formatting. FYI, this is a full AngularJS 6 project, hosted using Github Pages at https://namsor.github.io/phone-validation/ with a HTTPS custom domain. The website uses NamSor API v2.

The following sample shows how to validate a locally formated phone number into an international phone number E.164

E.164 is an ITU-T recommendation, titled The international public telecommunication numbering plan.

The API simply takes personal name : first name / given name and last name / surname, as well as the phone number. You don't need to have the phone number in an international format : it can be a local number.

Make a call to NamSor API https://v2.namsor.com/NamSorAPIv2/apidoc.html#/social/phoneCode with firstName lastName phoneNumber and pass the API Key as a X-API-KEY header.

Since POTUS gave his own personal number in a Tweet (https://twitter.com/realDonaldTrump/status/628590822913650688), we'll use that as a example :

curl -X GET "https://v2.namsor.com/NamSorAPIv2/api2/json/phoneCode/Donald/Trump/917.756.8000" -H "accept: application/json" -H "X-API-KEY: <your api key here>"

Will get you this JSON response :

{
  "id": null,
  "firstName": "Donald",
  "lastName": "Trump",
  "internationalPhoneNumberVerified": "+1 917-756-8000",
  "phoneCountryIso2Verified": "US",
  "phoneCountryCode": 1,
  "phoneCountryCodeAlt": 63,
  "phoneCountryIso2": "US",
  "phoneCountryIso2Alt": "PH",
  "originCountryIso2": "GB",
  "originCountryIso2Alt": "FR",
  "phoneNumber": "917.756.8000",
  "verified": true,
  "score": 1.8924464202870794
}

The main output is internationalPhoneNumberVerified, if the number could be verified using Google's validation API. Once you have this information, you can use additional APIs to enrich your customer information (ex. NumVerify https://numverify.com, Twilio https://www.twilio.com/lookup etc.)

You can try with a few numbers for yourself or see how the API can be used from AngularJS or JQuery here, https://namsor.github.io/phone-validation/

Google's phone validation API (googlei18n/libphonenumber) normally requires as input a COUNTRY and PHONE number. NamSor's phoneCode API combines the likely country of origin from the name and the predicted phone country, based on both name and phone number formatting, to call's google phone validation API and workaround its limitations.