how to get imei number in phonegap app with imeiplugin

Can anyone explain to me how to get the device's IMEI number from Phonegap? I am using the IMEI plugin in my app it is not showing anything.

To install, I have tried both:

phonegap plugin add https://github.com/zho/phonegap-imeiplugin.git

-- OR --

cordova plugin add imeiplugin

Example Usage:

window.plugins.imeiplugin.getImei(callback);

function callback(imei) {
    console.log("My Android IMEI :" + imei);

I want the output to be displayed when user opens the app, but it is not showing.

Solution

here is the solution that how can you use imeiplugin Index.html

<!DOCTYPE html>
 <html>
   <body>
     <h1 id="demo"></h1>
    <script type="text/javascript" src="cordova.js"></script>
    <script src="js/index.js"></script>
    <script> app.initialize(); </script>
   </body>
 </html>

Index.js

var app = {
        // Application Constructor
        initialize: function () {
            app.bindEvents();
        },
        bindEvents: function () {
            document.addEventListener('deviceready', app.onDeviceReady, false);
        },
        onDeviceReady: function () {
            window.plugins.imeiplugin.getImei(callback);    
        }
    };
    function callback(imei) {
        var element=document.getElementById("demo");
        element.value=imei;

    }