diff --git a/002_source/ionic_mobile/package-lock.json b/002_source/ionic_mobile/package-lock.json
index 18cf88e..aaf700d 100644
--- a/002_source/ionic_mobile/package-lock.json
+++ b/002_source/ionic_mobile/package-lock.json
@@ -32,6 +32,7 @@
         "ionicons": "^7.0.0",
         "lodash": "^4.17.21",
         "pocketbase": "^0.26.0",
+        "qr-code-styling": "^1.9.2",
         "react": "^18.2.0",
         "react-dom": "^18.2.0",
         "react-hook-form": "7.50.1",
@@ -13787,6 +13788,24 @@
         "teleport": ">=0.2.0"
       }
     },
+    "node_modules/qr-code-styling": {
+      "version": "1.9.2",
+      "resolved": "https://registry.npmjs.org/qr-code-styling/-/qr-code-styling-1.9.2.tgz",
+      "integrity": "sha512-RgJaZJ1/RrXJ6N0j7a+pdw3zMBmzZU4VN2dtAZf8ZggCfRB5stEQ3IoDNGaNhYY3nnZKYlYSLl5YkfWN5dPutg==",
+      "license": "MIT",
+      "dependencies": {
+        "qrcode-generator": "^1.4.4"
+      },
+      "engines": {
+        "node": ">=18.18.0"
+      }
+    },
+    "node_modules/qrcode-generator": {
+      "version": "1.4.4",
+      "resolved": "https://registry.npmjs.org/qrcode-generator/-/qrcode-generator-1.4.4.tgz",
+      "integrity": "sha512-HM7yY8O2ilqhmULxGMpcHSF1EhJJ9yBj8gvDEuZ6M+KGJ0YY2hKpnXvRD+hZPLrDVck3ExIGhmPtSdcjC+guuw==",
+      "license": "MIT"
+    },
     "node_modules/qs": {
       "version": "6.13.1",
       "resolved": "https://registry.npmjs.org/qs/-/qs-6.13.1.tgz",
diff --git a/002_source/ionic_mobile/package.json b/002_source/ionic_mobile/package.json
index 99d46d5..9df6e2c 100644
--- a/002_source/ionic_mobile/package.json
+++ b/002_source/ionic_mobile/package.json
@@ -43,14 +43,15 @@
     "@types/react-router": "^5.1.20",
     "@types/react-router-dom": "^5.3.3",
     "axios": "^1.8.1",
-    "react-i18next": "^15.2.0",
     "i18next": "^24.2.0",
     "ionicons": "^7.0.0",
     "lodash": "^4.17.21",
     "pocketbase": "^0.26.0",
+    "qr-code-styling": "^1.9.2",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "react-hook-form": "7.50.1",
+    "react-i18next": "^15.2.0",
     "react-markdown": "^9.0.3",
     "react-router": "^5.3.4",
     "react-router-dom": "^5.3.4",
diff --git a/002_source/ionic_mobile/src/App.tsx b/002_source/ionic_mobile/src/App.tsx
index 8c1c1c7..049d9d5 100644
--- a/002_source/ionic_mobile/src/App.tsx
+++ b/002_source/ionic_mobile/src/App.tsx
@@ -1,4 +1,4 @@
-import { DEBUG, DEBUG_LINK, QUIZ_MAIN_MENU_LINK, RECORD_LINK, SETTING_LINK } from './constants';
+import { DEBUG_LINK, isDevelop, QUIZ_MAIN_MENU_LINK, RECORD_LINK, SETTING_LINK } from './constants';
 /* Core CSS required for Ionic components to work properly */
 
 import '@ionic/react/css/core.css';
@@ -139,7 +139,7 @@ const TabButtons: React.FC = () => {
           <IonIcon aria-hidden="true" icon={settingsOutline} size="large" />
         </IonTabButton>
 
-        {DEBUG ? (
+        {isDevelop ? (
           <IonTabButton
             tab="debug"
             onClick={() => goSwitchPage(DEBUG_LINK)}
diff --git a/002_source/ionic_mobile/src/components/Footer/index.tsx b/002_source/ionic_mobile/src/components/Footer/index.tsx
new file mode 100644
index 0000000..b9b4f6b
--- /dev/null
+++ b/002_source/ionic_mobile/src/components/Footer/index.tsx
@@ -0,0 +1,25 @@
+import React from 'react';
+
+function Footer(): React.JSX.Element {
+  return (
+    <div
+      style={{
+        display: 'flex',
+        flexDirection: 'row',
+        justifyContent: 'center',
+        width: '100vw',
+        //
+        position: 'fixed',
+        bottom: '3rem',
+        //
+        fontWeight: '300',
+        fontSize: '0.7rem',
+        opacity: '0.9',
+      }}
+    >
+      2025 louislabs
+    </div>
+  );
+}
+
+export default Footer;
diff --git a/002_source/ionic_mobile/src/constants.tsx b/002_source/ionic_mobile/src/constants.tsx
index 785451a..18c3c88 100644
--- a/002_source/ionic_mobile/src/constants.tsx
+++ b/002_source/ionic_mobile/src/constants.tsx
@@ -90,6 +90,8 @@ export const COL_USER_METAS = 'UserMetas';
 //
 export const RUNNING_PLATFORM = Capacitor.getPlatform();
 
+export const isDevelop = import.meta.env.DEV;
+
 export {
   //
   API_URL,
diff --git a/002_source/ionic_mobile/src/contexts/CheckScreenWidth/QrHere/avatar.jpg b/002_source/ionic_mobile/src/contexts/CheckScreenWidth/QrHere/avatar.jpg
new file mode 100644
index 0000000..5e08e63
Binary files /dev/null and b/002_source/ionic_mobile/src/contexts/CheckScreenWidth/QrHere/avatar.jpg differ
diff --git a/002_source/ionic_mobile/src/contexts/CheckScreenWidth/QrHere/index.tsx b/002_source/ionic_mobile/src/contexts/CheckScreenWidth/QrHere/index.tsx
new file mode 100644
index 0000000..ba97a2f
--- /dev/null
+++ b/002_source/ionic_mobile/src/contexts/CheckScreenWidth/QrHere/index.tsx
@@ -0,0 +1,51 @@
+import { useEffect, useRef, useState } from 'react';
+import './styles.css';
+import QRCodeStyling from 'qr-code-styling';
+import AvatarJpg from './avatar.jpg';
+
+const qrCode = new QRCodeStyling({
+  width: 200,
+  height: 200,
+  image: AvatarJpg,
+  dotsOptions: {
+    color: '#4267b2',
+    type: 'rounded',
+  },
+  imageOptions: {
+    crossOrigin: 'anonymous',
+    margin: 2,
+  },
+});
+
+export default function App() {
+  const [url, setUrl] = useState(window.location.href);
+  const [fileExt, setFileExt] = useState('png');
+  const ref = useRef(null);
+
+  useEffect(() => {
+    if (ref.current) {
+      qrCode.append(ref.current);
+    }
+  }, []);
+
+  useEffect(() => {
+    qrCode.update({
+      data: url,
+    });
+  }, [url]);
+
+  const onUrlChange = (event: React.ChangeEvent<HTMLInputElement>) => {
+    event.preventDefault();
+    setUrl(event.target.value);
+  };
+
+  const onExtensionChange = (event: React.ChangeEvent<HTMLInputElement>) => {
+    setFileExt(event.target.value);
+  };
+
+  return (
+    <div>
+      <div ref={ref} />
+    </div>
+  );
+}
diff --git a/002_source/ionic_mobile/src/contexts/CheckScreenWidth/QrHere/styles.css b/002_source/ionic_mobile/src/contexts/CheckScreenWidth/QrHere/styles.css
new file mode 100644
index 0000000..59b0604
--- /dev/null
+++ b/002_source/ionic_mobile/src/contexts/CheckScreenWidth/QrHere/styles.css
@@ -0,0 +1,4 @@
+.App {
+  font-family: sans-serif;
+  text-align: center;
+}
diff --git a/002_source/ionic_mobile/src/contexts/CheckScreenWidth/index.tsx b/002_source/ionic_mobile/src/contexts/CheckScreenWidth/index.tsx
new file mode 100644
index 0000000..852368b
--- /dev/null
+++ b/002_source/ionic_mobile/src/contexts/CheckScreenWidth/index.tsx
@@ -0,0 +1,43 @@
+import * as React from 'react';
+import QrHere from './QrHere';
+import { IonText } from '@ionic/react';
+import { useTranslation } from 'react-i18next';
+import Footer from '../../components/Footer';
+
+export interface ProviderProps {
+  children: React.ReactNode;
+}
+
+export function CheckScreenWidth({ children }: ProviderProps): React.JSX.Element {
+  const { t } = useTranslation();
+  const [showQrCode, setShowQrCode] = React.useState(false);
+  React.useEffect(() => {
+    setShowQrCode(window.screen.width > 800);
+  }, []);
+  return (
+    <>
+      {showQrCode ? (
+        <>
+          <div
+            style={{
+              width: '100vw',
+              height: '100vh',
+              display: 'flex',
+              flexDirection: 'column',
+              justifyContent: 'center',
+              alignItems: 'center',
+              gap: '1rem',
+            }}
+          >
+            <QrHere />
+
+            <IonText>{t('please-use-mobile-for-better-experience')}</IonText>
+          </div>
+          <Footer />
+        </>
+      ) : (
+        <>{children}</>
+      )}
+    </>
+  );
+}
diff --git a/002_source/ionic_mobile/src/contexts/I18nProvider.tsx b/002_source/ionic_mobile/src/contexts/I18nProvider.tsx
index 212f9ba..bbff96c 100644
--- a/002_source/ionic_mobile/src/contexts/I18nProvider.tsx
+++ b/002_source/ionic_mobile/src/contexts/I18nProvider.tsx
@@ -4,16 +4,15 @@ import { useTranslation } from 'react-i18next';
 import '../i18n';
 
 export interface I18nProviderProps {
-  children: React.ReactNode;
   language?: string;
 }
 
-export function I18nProvider({ children, language = 'en' }: I18nProviderProps): React.JSX.Element {
+export function I18nProvider({ language = 'en' }: I18nProviderProps): React.JSX.Element {
   const { i18n } = useTranslation();
 
   React.useEffect(() => {
     //
   }, [i18n, language]);
 
-  return <>{children}</>;
+  return <></>;
 }
diff --git a/002_source/ionic_mobile/src/contexts/index.tsx b/002_source/ionic_mobile/src/contexts/index.tsx
index 016007f..5a2e685 100644
--- a/002_source/ionic_mobile/src/contexts/index.tsx
+++ b/002_source/ionic_mobile/src/contexts/index.tsx
@@ -1,6 +1,7 @@
 import { PocketBaseProvider } from '../hooks/usePocketBase';
 import { AppStateProvider } from './AppState';
 import { UserProvider } from './auth/user-context';
+import { CheckScreenWidth } from './CheckScreenWidth';
 import { I18nProvider } from './I18nProvider';
 import { MyIonFavoriteProvider } from './MyIonFavorite';
 import { MyIonMetricProvider } from './MyIonMetric';
@@ -13,7 +14,8 @@ const queryClient = new QueryClient();
 const ContextMeta = ({ children }: { children: React.ReactNode }) => {
   return (
     <>
-      <I18nProvider>
+      <I18nProvider></I18nProvider>
+      <CheckScreenWidth>
         <AppStateProvider>
           <UserProvider>
             <MyIonStoreProvider>
@@ -32,7 +34,7 @@ const ContextMeta = ({ children }: { children: React.ReactNode }) => {
             </MyIonStoreProvider>
           </UserProvider>
         </AppStateProvider>
-      </I18nProvider>
+      </CheckScreenWidth>
     </>
   );
 };
diff --git a/002_source/ionic_mobile/src/locale/en.ts b/002_source/ionic_mobile/src/locale/en.ts
index f7dd738..2f7cbab 100644
--- a/002_source/ionic_mobile/src/locale/en.ts
+++ b/002_source/ionic_mobile/src/locale/en.ts
@@ -2,9 +2,10 @@
 // (tip move them in a JSON file and import them)
 const en = {
   translation: {
-    hello: 'world',
-    Loading: 'loading',
-    lesson: 'lesson',
+    'hello': 'world',
+    'Loading': 'loading',
+    'lesson': 'lesson',
+    'please-use-mobile-for-better-experience': 'Please use mobile for better experience',
   },
 };
 
diff --git a/002_source/ionic_mobile/src/locale/resources.ts b/002_source/ionic_mobile/src/locale/resources.ts
deleted file mode 100644
index f74d0b7..0000000
--- a/002_source/ionic_mobile/src/locale/resources.ts
+++ /dev/null
@@ -1,5 +0,0 @@
-import en from './en';
-
-export default {
-  en,
-};
diff --git a/002_source/ionic_mobile/src/locale/zh.ts b/002_source/ionic_mobile/src/locale/zh.ts
index 9d1046e..e504bd4 100644
--- a/002_source/ionic_mobile/src/locale/zh.ts
+++ b/002_source/ionic_mobile/src/locale/zh.ts
@@ -2,9 +2,10 @@
 // (tip move them in a JSON file and import them)
 const zh = {
   translation: {
-    hello: '你好',
-    Loading: 'loading',
-    lesson: 'lesson',
+    'hello': '你好',
+    'Loading': '加載中',
+    'lesson': '課程',
+    'please-use-mobile-for-better-experience': '為了更好的體驗，請使用手機瀏覽 😊',
   },
 };