phone number validation

checkPhone.js

function checkPhone(phone) {
    var phoneVal = phone.val();
    var reg = /^(\s*)?(\+)?([- ():=+]?\d[- ():=+]?){10,14}(\s*)?$/;
    console.log(reg);
    
    if (!reg.test(phoneVal)) {
        phone.addClass("error");
        return false;
    } else {
        phone.removeClass("error");
        return true;
    }
}