diff --git a/android/app/src/main/AndroidManifest.xml b/android/app/src/main/AndroidManifest.xml
index bb2f9fe..98c4f31 100644
--- a/android/app/src/main/AndroidManifest.xml
+++ b/android/app/src/main/AndroidManifest.xml
@@ -1,7 +1,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.example.contact_tracing">
     <application
-        android:label="contact_tracing"
+        android:label="Contact Tracing"
         android:name="${applicationName}"
         android:icon="@mipmap/ic_launcher">
         <activity
@@ -39,4 +39,5 @@
       </intent>
     </queries>
     <uses-permission android:name="android.permission.SEND_SMS"/>
+    <uses-permission android:name="android.permission.VIBRATE"/>
 </manifest>
diff --git a/lib/main.dart b/lib/main.dart
index 0fea2c2..273c75c 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -1,3 +1,4 @@
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:mobile_scanner/mobile_scanner.dart';
 import 'package:flutter_sms/flutter_sms.dart';
@@ -16,7 +17,8 @@ class AnalyzeView extends StatefulWidget {
 class AnalyzeViewState extends State<AnalyzeView>
     with SingleTickerProviderStateMixin {
   String? barcode;
-  double number = 1;
+  double peopleCount = 1;
+  final String prefix = 'smsto:1922:';
 
   MobileScannerController controller = MobileScannerController(
     torchEnabled: false,
@@ -26,9 +28,13 @@ class AnalyzeViewState extends State<AnalyzeView>
   void _sendSMS(String message, List<String> recipents) async {
     String _result = await sendSMS(message: message, recipients: recipents)
         .catchError((onError) {
-      print('sms err: $onError');
+      if (kDebugMode) {
+        print('sms err: $onError');
+      }
     });
-    print('sms res: $_result');
+    if (kDebugMode) {
+      print('sms res: $_result');
+    }
   }
 
   @override
@@ -39,20 +45,33 @@ class AnalyzeViewState extends State<AnalyzeView>
         body: Builder(builder: (context) {
           return Stack(
             children: [
-              MobileScanner(
-                  controller: controller,
-                  fit: BoxFit.contain,
-                  onDetect: (barcode, args) {
-                    if (this.barcode != barcode.rawValue) {
-                      setState(() {
-                        this.barcode = barcode.rawValue;
-                      });
-                      if (barcode.rawValue.startsWith('smsto:1922:')) {
-                        List<String> recipents = ['0926381229'];
-                        _sendSMS('test2', recipents);
-                      }
-                    }
-                  }),
+              Align(
+                alignment: Alignment.center,
+                child: Container(
+                  width: MediaQuery.of(context).size.width - 100,
+                  color: Colors.black.withOpacity(0.0),
+                  child: MobileScanner(
+                      controller: controller,
+                      fit: BoxFit.contain,
+                      onDetect: (barcode, args) {
+                        if (this.barcode != barcode.rawValue) {
+                          setState(() {
+                            this.barcode = barcode.rawValue;
+                          });
+                          String msg = barcode.rawValue.toLowerCase();
+                          if (msg.startsWith(prefix)) {
+                            List<String> recipents = ['1922'];
+                            msg = msg.substring(prefix.length);
+                            if (peopleCount > 1) {
+                              msg += ' +${peopleCount.toInt()}';
+                            }
+                            _sendSMS(msg, recipents);
+                          }
+                        }
+                      }),
+                ),
+              ),
+
               Align(
                 alignment: Alignment.bottomCenter,
                 child: Container(
@@ -62,6 +81,7 @@ class AnalyzeViewState extends State<AnalyzeView>
                     child: Column(
                       children: [
                         Row(
+                          crossAxisAlignment: CrossAxisAlignment.center,
                           children: [
                             Center(
                               child: SizedBox(
@@ -69,13 +89,14 @@ class AnalyzeViewState extends State<AnalyzeView>
                                 height: 80,
                                 child: FittedBox(
                                   child: Slider(
-                                      value: number,
+                                      value: peopleCount,
                                       min: 1,
                                       max: 10,
-                                      label: 'Count $number',
+                                      divisions: 9,
+                                      label: 'People: ${peopleCount.toInt()}',
                                       onChanged: (v) {
                                         setState(() {
-                                          number = v.toInt().toDouble();
+                                          peopleCount = v;
                                         });
                                       }),
                                 ),
@@ -107,7 +128,7 @@ class AnalyzeViewState extends State<AnalyzeView>
                             ),
                             Center(
                               child: SizedBox(
-                                width: MediaQuery.of(context).size.width - 120,
+                                width: MediaQuery.of(context).size.width - 220,
                                 height: 50,
                                 child: FittedBox(
                                   child: Text(
@@ -115,7 +136,7 @@ class AnalyzeViewState extends State<AnalyzeView>
                                     overflow: TextOverflow.fade,
                                     style: Theme.of(context)
                                         .textTheme
-                                        .headline4!
+                                        .headlineSmall!
                                         .copyWith(color: Colors.white),
                                   ),
                                 ),