JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <div class="tel">
        <a href="#">12345678Something</a>
    </div>
    <div class="tel">
        <a href="#">12345678Another</a>
    </div>
</div>

JavaScript

var data = $("div");

var phoneArray = $(data).find(".tel a").map(function (i, el) {
    return $(el).text().substring(8);
}).get();

console.log(phoneArray);