Auth login with email or mobile Cakephp

I am working on cakephp 2.x.i have a table in my database name user and it has 4 fields id, email, password and mobileNo

what i want is i want to login the user from his mobileNo too(if he typed mobile number rather then email address) just like facebook has done ..he can either login with hi email address or mobileno .i dont want to create another input field.. i dont know how can i do this here is my code 

i have two fields in my login.ctp

<?php       echo $this->form->create();    echo $this->form->input('email',array('type'=>'text'));//i do this type = text because otherwise if i typed number in browser then it gives me error that type type email address ...   echo $this->form->input('password');      echo $this->form->end('submit');   ?>

AppController

  
class AppController extends Controller {   public $components = array(  'Session',  'Auth'=>array(  'loginRedirect'=>array('controller'=>'users', 'action'=>'admin'),  'logoutRedirect'=>array('controller'=>'users', 'action'=>'admin'),  'authError'=>"You can't access that page",  'authorize'=>array('Controller'),    'authenticate' => array(     'Form' => array(      'fields' => array('username' => 'email')      )))      );   )   );      public function isAuthorized($user) {   }     public function beforeFilter() {   $this->Auth->allow('index');   }  }

UserController

class UsersController extends AppController {      public function beforeFilter() {          parent::beforeFilter();                                }                    public function login() {          $this->layout='userdefault';          if ($this->request->is('post')) {                              if ($this->Auth->login()) {                  debug($this->Auth->login());                  $this->redirect($this->Auth->redirect());              } else {                  $this->Session->setFlash('Your username/password combination was incorrect');//this will redisplay the login page              }          }      }
  

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