In console, have you an error or a warning?
Check your path to be correct. Where have you installed cordova?
An example:
In my case i have:
<script src="lib/ng-cordova-0.1.17-alpha/dist/ng-cordova.js"></script>
I give the full path.
Do you give the correct path?
You can use the following steps:
$ bower install ngCordova
Include ng-cordova.js or ng-cordova.min.js in your index.html file before cordova.js and after your AngularJS / Ionic file (since ngCordova depends on AngularJS).
<script src="lib/ngCordova/dist/ng-cordova.js"></script>
<script src="cordova.js"></script>
Then, include ngCordova as a dependency in your angular module:
angular.module('myApp', ['ngCordova'])