angular js muti modules

var alert=angular.module('alert',['ui.bootstrap']).controller('AlertDemoCtrl', function ($scope) {
  $scope.alerts = [
    { type: 'danger', msg: 'Oh snap! Change a few things up and try submitting again.' },
    { type: 'success', msg: 'Well done! You successfully read this important alert message.' }
  ];

  $scope.addAlert = function() {
    $scope.alerts.push({msg: 'Another alert!'});
  };

  $scope.closeAlert = function(index) {
    $scope.alerts.splice(index, 1);
  };
});

//just add in your main app called phonecatApp 
var phonecatApp = angular.module('phonecatApp', ['alert']);

phonecatApp.controller('PhoneListCtrl', function ($scope) {
  $scope.phones = [
    {'name': 'Nexus S',
     'snippet': 'Fast just got faster with Nexus S.'},
    {'name': 'Motorola XOOM™ with Wi-Fi',
     'snippet': 'The Next, Next Generation tablet.'},
    {'name': 'MOTOROLA XOOM™',
     'snippet': 'The Next, Next Generation tablet.'}
  ];
});