Angular form checkbox default value

I've been trying to grab hold of the Angular forms applying best practices for form validations, that forced me to use the form name and have all of the models as children of it so that I can bind the formname.$valid and all the other stuff.

However I haven't been able to set predefined values to any of the form sub models as I have no access to them in the controller.

My biggest problem right now is how to check for falsy checkboxes because initially the checkbox is unchecked but there is no value, it only gets populated when clicked to change the value.

Here is my form code

  <form name="addAppForm" ng-if="creatingApp == false">

      <input type="text" placeholder="App Name" required autofocus ng-model="addAppForm.appName">

      <input icheck id="ios" type="checkbox" ng-init="addAppForm.iOS = false" ng-model="addAppForm.iOS">
       <label for="ios"><i class="icon-apple"></i> iOS {{addAppForm.iOS}}</label>

       <input icheck id="android" type="checkbox" ng-init="addAppForm.android = false" ng-model="addAppForm.android">
       <label for="android"><i class="icon-android"></i> Android {{addAppForm.android}}</label>

    <button ng-disabled="addAppForm.$invalid && (addAppForm.iOS != true && addAppForm.android != true)" type="submit" ng-click="addNewApp(addAppForm.iOS, addAppForm.android, addAppForm.appName)" class="button front-primary large radius expand">Let's GO!</button>

  </form>

The "required" directive doesn't apply to the checkboxes and I've tried initializing the model but with no luck.