code: function(mobilePhone, smsCode) {
          var user = AV.Object._create('_User');
          user._finishFetch({ mobilePhoneNumber: mobilePhone, smsCode: smsCode });
          return user.logIn();
        }
docs: Logs in a user with a mobile phone number and sms code sent by
  AV.User.requestLoginSmsCode.On success, this
  saves the session to disk, so you can retrieve the currently logged in
  user using <code>current</code>.
  
  @param {String} mobilePhone The user's mobilePhoneNumber
  @param {String} smsCode The sms code sent by AV.User.requestLoginSmsCode
  @return {Promise} A promise that is fulfilled with the user when
  the login completes.
  @see AV.User#logIn