customization of phone format

"use strict";

var $j = jQuery.noConflict();
var gfpiElements = [];

$j(document).bind('gform_post_render', function(event, form_id){

    var gfpValidationJsVars = window["gfpValidationJsVars_"+form_id];

    if (!gfpValidationJsVars) { return; }

    var telInputs = $j(gfpValidationJsVars.elements).toArray();
    gfpiElements = telInputs;

    for (var i = 0; i < telInputs.length; i++) {

        var telInput = $j(telInputs[i]);

        telInput.after('<span class="int-phone valid-msg hide">'+ gfpValidationJsVars.successMessage +'</span>');
        telInput.after('<span class="int-phone error-msg hide">'+ gfpValidationJsVars.failMessage +'</span>');

        telInput.blur(function() {
            wpisValidateIntPhone($j(this));
        });

        telInput.keydown(function() {
          wpisHideValidationErrors($j(this));
        });

        if ( telInput.val().length > 0 ) {
            (function(telInput){
                setTimeout(function(){
                    wpisValidateIntPhone(telInput);
                }, 3000);
            })(telInput);
        }

    }// END loop

});

function validateAllPhoneFields() {
    if (!Array.isArray(gfpiElements) || gfpiElements.length === 0 || !gfpConfigJsVars.preventWrongPhoneSubmit) { return; }

    const telInputs = gfpiElements;
    let valid = true;

    for (var i = 0; i < telInputs.length; i++) {
        const telInput = $j(telInputs[i]);

        if (!telInput.intlTelInput("isValidNumber")) {
            valid = false;
        }

    }

    if (telInputs[0]) {
        let $submitBtn = $j(telInputs[0]).closest('form').find(':submit');

        if ( valid ) {
            $submitBtn.prop( "disabled", false );
        } else {
            $submitBtn.prop( "disabled", true );
        }

    }
}

function wpisHideValidationErrors(telInput) {
  telInput.removeClass("error");
  telInput.parent().parent().find(".error-msg").addClass("hide");
  telInput.parent().parent().find(".valid-msg").addClass("hide");
}

function wpisValidateIntPhone(telInput) {

    var errorMsg = telInput.parent().parent().find(".error-msg"),
    validMsg = telInput.parent().parent().find(".valid-msg");

    wpisHideValidationErrors(telInput);

    if ($j.trim(telInput.val())) {

        if (telInput.intlTelInput("isValidNumber")) {
            validMsg.removeClass("hide");
            let nationalPhone = telInput.intlTelInput("getNumber");
// NEW LINES
            const countryData = telInput.intlTelInput("getSelectedCountryData");
            nationalPhone = nationalPhone.replace(`+${countryData.dialCode}`, `+${countryData.dialCode} `);
// END NEW LINES
            telInput.val(nationalPhone);
        } else {
            telInput.addClass("error");
            errorMsg.removeClass("hide");
            validMsg.addClass("hide");
        }

        validateAllPhoneFields();
    }
}