document.addEventListener('DOMContentLoaded', function() { // Change the number here var oldNumber = '(215) 774-2929'; var newNumber = '(888) 913-2075'; // Find all text nodes in the document var elements = document.getElementsByTagName('*'); for (var i = 0; i < elements.length; i++) { var element = elements[i]; for (var j = 0; j < element.childNodes.length; j++) { var node = element.childNodes[j]; if (node.nodeType === 3) { // Text node var text = node.nodeValue; var replacedText = text.replace(oldNumber, newNumber); if (replacedText !== text) { element.replaceChild(document.createTextNode(replacedText), node); } } } } });