diff --git a/app/js/controllers.js b/app/js/controllers.js
index ad7ffe58..e6e05dc1 100644
--- a/app/js/controllers.js
+++ b/app/js/controllers.js
@@ -219,6 +219,10 @@ angular.module('myApp.controllers', ['myApp.i18n'])
               $scope.error = {field: 'phone'}
               error.handled = true
               break
+
+            case 'PHONE_NUMBER_APP_SIGNUP_FORBIDDEN':
+              $scope.error = {field: 'phone'}
+              break
           }
         })['finally'](function () {
           if ($rootScope.idle.isIDLE || tsNow() - authKeyStarted > 60000) {
diff --git a/app/js/locales/en-us.json b/app/js/locales/en-us.json
index 4ba085f1..401da1a9 100644
--- a/app/js/locales/en-us.json
+++ b/app/js/locales/en-us.json
@@ -420,6 +420,7 @@
 	 "error_modal_username_not_found_description": "There is no Telegram account with the username you provided.",
 	"error_modal_phonecalls_not_supported_description_md": "Unfortunately calls are not supported in the Web App at the moment.\n\nYou can call {user} using our mobile apps or native desktop applications.\n{download-link: Download »}",
 	"error_modal_fresh_reset_authorization_forbidden": "For security reasons, you can't terminate older sessions from a device that you've just connected. Please use an earlier connection or wait for a few hours",
+	"error_modal_app_signup_forbidden_md": "You don't have a Telegram account yet, please **sign up** with {signup-link: Android / iPhone} first.",
 
 	"error_modal_bad_request_description": "One of the params is missing or invalid.",
 	"error_modal_unauthorized_description": "This action requires authorization access. Please {login-link: log in}.",
diff --git a/app/partials/desktop/error_modal.html b/app/partials/desktop/error_modal.html
index 6eb56570..51640358 100644
--- a/app/partials/desktop/error_modal.html
+++ b/app/partials/desktop/error_modal.html
@@ -40,6 +40,10 @@
       <span ng-switch-when="USERNAME_INVALID" my-i18n="error_modal_username_invalid_description"></span>
       <span ng-switch-when="USERNAME_OCCUPIED" my-i18n="error_modal_username_occupied_description"></span>
       <span ng-switch-when="MEDIA_TYPE_NOT_SUPPORTED" my-i18n="error_modal_media_not_supported_description"></span>
+      <span ng-switch-when="PHONE_NUMBER_APP_SIGNUP_FORBIDDEN" my-i18n="error_modal_app_signup_forbidden_md">
+        <my-i18n-param name="signup-link"><a href="https://telegram.org/dl" target="_blank">{0}</a></my-i18n-param>
+      </span>
+
       <span ng-switch-when="USERNAME_NOT_OCCUPIED" my-i18n="error_modal_username_not_found_description"></span>
       <span ng-switch-when="USER_NOT_MUTUAL_CONTACT" my-i18n="error_modal_user_not_mutual_contact"></span>
       <span ng-switch-when="INVITE_HASH_INVALID" my-i18n="error_modal_invite_link_invalid"></span>
@@ -58,7 +62,7 @@
         <my-i18n-param name="download-link"><a href="https://telegram.org/dl" target="_blank">{0}</a></my-i18n-param>
         
       </span>
-      
+
       <span ng-switch-when="CALLBACK_RESPONSE" ng-bind-html="error.description_html"></span>
 
       <span ng-switch-when="FRESH_RESET_AUTHORISATION_FORBIDDEN" my-i18n="error_modal_fresh_reset_authorization_forbidden"></span>