diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..a47e5ff
Binary files /dev/null and b/.DS_Store differ
diff --git a/app/App.tsx b/app/App.tsx
index 498ca44..399aea8 100644
--- a/app/App.tsx
+++ b/app/App.tsx
@@ -1,21 +1,32 @@
+<<<<<<< HEAD
+import { useState } from 'react';
+import PhoneInput from 'react-phone-number-input';
+import 'react-phone-number-input/style.css';
+
+function test() {
+=======
 import { StatusBar } from 'expo-status-bar';
 import { StyleSheet, Text, View } from 'react-native';
-
-import WelcomePage from './components/welcome';
+import Example from './components/sign-in';
 
 export default function App() {
   return (
     <View style={styles.container}>
-      <WelcomePage profile = "My profile name" image = "hi"></WelcomePage>
+      <Example></Example>
+      <StatusBar style="auto" />
     </View>
   );
+>>>>>>> 3799a0a1ae022420ff10b334a2d7723c12090d77
 }
-
-const styles = StyleSheet.create({
-  container: {
-    flex: 1,
-    backgroundColor: '#fff',
-    alignItems: 'center',
-    justifyContent: 'center',
-  },
-});
+function Example() {
+  // `value` will be the parsed phone number in E.164 format.
+  // Example: "+12133734253".
+  const [value, setValue] = useState()
+  return (
+    <PhoneInput
+      placeholder="Enter phone number"
+      value={value}
+      onChange = setValue/>
+  )
+}
+export default Example;
\ No newline at end of file
diff --git a/app/components/sign-in.tsx b/app/components/sign-in.tsx
new file mode 100644
index 0000000..36cf35b
--- /dev/null
+++ b/app/components/sign-in.tsx
@@ -0,0 +1,68 @@
+<<<<<<< HEAD
+import { useState } from 'react';
+import PhoneInput from 'react-phone-number-input';
+import 'react-phone-number-input/style.css';
+=======
+>>>>>>> 3799a0a1ae022420ff10b334a2d7723c12090d77
+
+
+function Example() {
+  // `value` will be the parsed phone number in E.164 format.
+  // Example: "+12133734253".
+<<<<<<< HEAD
+  const [value, setValue] = useState()
+=======
+  const [value, setValue] = useState("1")
+>>>>>>> 3799a0a1ae022420ff10b334a2d7723c12090d77
+  return (
+    <PhoneInput
+      placeholder="Enter phone number"
+      value={value}
+<<<<<<< HEAD
+      onChange={setValue}/>
+  )
+}
+export default Example;
+=======
+      onChange={() =>setValue("2")}/>
+  )
+}
+
+export default Example;
+
+
+
+
+
+/*
+
+//
+import {SafeAreaView, StyleSheet, TextInput, Text} from 'react-native';
+const TextInputExample = () => {
+  const [text, onChangeText] = React.useState('Useless Text');
+  const [number, onChangeNumber] = React.useState('');
+
+  return (
+    <SafeAreaView>
+      <Text>Phone Number</Text>
+      <TextInput
+        style={styles.input}
+        onChangeText={onChangeNumber}
+        value={number}
+        placeholder="Phone Number"
+        keyboardType="numeric"
+      />
+    </SafeAreaView>
+  );
+};
+
+const styles = StyleSheet.create({
+  input: {
+    height: 40,
+    margin: 12,
+    borderWidth: 1,
+    padding: 10,
+  },
+});
+*/
+>>>>>>> 3799a0a1ae022420ff10b334a2d7723c12090d77
diff --git a/app/package-lock.json b/app/package-lock.json
index 5a8cb25..3cdde87 100644
--- a/app/package-lock.json
+++ b/app/package-lock.json
@@ -11,7 +11,8 @@
         "expo": "~49.0.13",
         "expo-status-bar": "~1.6.0",
         "react": "18.2.0",
-        "react-native": "0.72.5"
+        "react-native": "0.72.5",
+        "react-phone-number-input": "^3.3.7"
       },
       "devDependencies": {
         "@babel/core": "^7.20.0",
@@ -6739,6 +6740,11 @@
         "node": ">=8"
       }
     },
+    "node_modules/classnames": {
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/classnames/-/classnames-2.3.2.tgz",
+      "integrity": "sha512-CSbhY4cFEJRe6/GQzIk5qXZ4Jeg5pcsP7b5peFSDpffpe1cqjASH/n9UTjBwOp6XpMSTwQ8Za2K5V02ueA7Tmw=="
+    },
     "node_modules/clean-stack": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/clean-stack/-/clean-stack-2.2.0.tgz",
@@ -6996,6 +7002,11 @@
         "node": ">=4"
       }
     },
+    "node_modules/country-flag-icons": {
+      "version": "1.5.7",
+      "resolved": "https://registry.npmjs.org/country-flag-icons/-/country-flag-icons-1.5.7.tgz",
+      "integrity": "sha512-AdvXhMcmSp7nBSkpGfW4qR/luAdRUutJqya9PuwRbsBzuoknThfultbv7Ib6fWsHXC43Es/4QJ8gzQQdBNm75A=="
+    },
     "node_modules/cross-fetch": {
       "version": "3.1.8",
       "resolved": "https://registry.npmjs.org/cross-fetch/-/cross-fetch-3.1.8.tgz",
@@ -8300,6 +8311,14 @@
       "resolved": "https://registry.npmjs.org/ini/-/ini-1.3.8.tgz",
       "integrity": "sha512-JV/yugV2uzW5iMRSiZAyDtQd+nxtUnjeLt0acNdw98kKLrvuRVyB80tsREOE7yvGVgalhZ6RNXCmEHkUKBKxew=="
     },
+    "node_modules/input-format": {
+      "version": "0.3.8",
+      "resolved": "https://registry.npmjs.org/input-format/-/input-format-0.3.8.tgz",
+      "integrity": "sha512-tLR0XRig1xIcG1PtIpMd/uoltvkAI62CN9OIbtj4/tEJAkqTCQLNHUZ9N4M46w0dopny7Rlt/lRH5Xzp7e6F+g==",
+      "dependencies": {
+        "prop-types": "^15.8.1"
+      }
+    },
     "node_modules/internal-ip": {
       "version": "4.3.0",
       "resolved": "https://registry.npmjs.org/internal-ip/-/internal-ip-4.3.0.tgz",
@@ -9404,6 +9423,11 @@
         "node": ">=6"
       }
     },
+    "node_modules/libphonenumber-js": {
+      "version": "1.10.49",
+      "resolved": "https://registry.npmjs.org/libphonenumber-js/-/libphonenumber-js-1.10.49.tgz",
+      "integrity": "sha512-gvLtyC3tIuqfPzjvYLH9BmVdqzGDiSi4VjtWe2fAgSdBf0yt8yPmbNnRIHNbR5IdtVkm0ayGuzwQKTWmU0hdjQ=="
+    },
     "node_modules/lightningcss": {
       "version": "1.19.0",
       "resolved": "https://registry.npmjs.org/lightningcss/-/lightningcss-1.19.0.tgz",
@@ -11736,6 +11760,28 @@
         }
       }
     },
+    "node_modules/react-dom": {
+      "version": "18.2.0",
+      "resolved": "https://registry.npmjs.org/react-dom/-/react-dom-18.2.0.tgz",
+      "integrity": "sha512-6IMTriUmvsjHUjNtEDudZfuDQUoWXVxKHhlEGSk81n4YFS+r/Kl99wXiwlVXtPBtJenozv2P+hxDsw9eA7Xo6g==",
+      "peer": true,
+      "dependencies": {
+        "loose-envify": "^1.1.0",
+        "scheduler": "^0.23.0"
+      },
+      "peerDependencies": {
+        "react": "^18.2.0"
+      }
+    },
+    "node_modules/react-dom/node_modules/scheduler": {
+      "version": "0.23.0",
+      "resolved": "https://registry.npmjs.org/scheduler/-/scheduler-0.23.0.tgz",
+      "integrity": "sha512-CtuThmgHNg7zIZWAXi3AsyIzA3n4xx7aNyjwC2VJldO2LMVDhFK+63xGqq6CsJH4rTAt6/M+N4GhZiDYPx9eUw==",
+      "peer": true,
+      "dependencies": {
+        "loose-envify": "^1.1.0"
+      }
+    },
     "node_modules/react-is": {
       "version": "17.0.2",
       "resolved": "https://registry.npmjs.org/react-is/-/react-is-17.0.2.tgz",
@@ -11814,6 +11860,22 @@
         "async-limiter": "~1.0.0"
       }
     },
+    "node_modules/react-phone-number-input": {
+      "version": "3.3.7",
+      "resolved": "https://registry.npmjs.org/react-phone-number-input/-/react-phone-number-input-3.3.7.tgz",
+      "integrity": "sha512-/yusEJl2oJA5rTRtny59pf7T1gg/whmfhdZsgrZaL063KEx6FFnmwTskTJ9yR4lYgzj2GyUjXpnA3O9d+ZTHwA==",
+      "dependencies": {
+        "classnames": "^2.3.1",
+        "country-flag-icons": "^1.5.4",
+        "input-format": "^0.3.8",
+        "libphonenumber-js": "^1.10.48",
+        "prop-types": "^15.8.1"
+      },
+      "peerDependencies": {
+        "react": ">=16.8",
+        "react-dom": ">=16.8"
+      }
+    },
     "node_modules/react-refresh": {
       "version": "0.4.3",
       "resolved": "https://registry.npmjs.org/react-refresh/-/react-refresh-0.4.3.tgz",
diff --git a/app/package.json b/app/package.json
index 82df200..863c3d6 100644
--- a/app/package.json
+++ b/app/package.json
@@ -12,7 +12,8 @@
     "expo": "~49.0.13",
     "expo-status-bar": "~1.6.0",
     "react": "18.2.0",
-    "react-native": "0.72.5"
+    "react-native": "0.72.5",
+    "react-phone-number-input": "^3.3.7"
   },
   "devDependencies": {
     "@babel/core": "^7.20.0",
diff --git a/server/.env b/server/.env
deleted file mode 100644
index 44b9b8c..0000000
--- a/server/.env
+++ /dev/null
@@ -1,4 +0,0 @@
-MONGO_ADMIN_USERNAME = "thiwalk30-admin"
-MONGO_ADMIN_PASSWORD = "Nwn3sXmdo9mwEqZx"
-AWS_ACCESS_KEY = "AKIA3ALRGMM244E2YBZZ"
-AWS_SECRET_ACCESS_KEY = "uKR37SNf++NH6WN0p+Dxhv5r7+tTUjgRr+QmI9p6"
\ No newline at end of file
diff --git a/server/.env.sample b/server/.env.sample
new file mode 100644
index 0000000..31510d1
--- /dev/null
+++ b/server/.env.sample
@@ -0,0 +1,7 @@
+MONGO_ADMIN_USERNAME="username"
+MONGO_ADMIN_PASSWORD="password"
+AWS_ACCESS_KEY="access_key_pub"
+AWS_SECRET_ACCESS_KEY="access_key_priv"
+TWILIO_AUTH_TOKEN="token"
+TWILIO_ACCOUNT_SID="sid"
+TWILIO_SERVICE_SID="service_sid"
\ No newline at end of file
diff --git a/server/backend_helper/index.js b/server/backend_helper/index.js
new file mode 100644
index 0000000..f2b5879
--- /dev/null
+++ b/server/backend_helper/index.js
@@ -0,0 +1,3 @@
+const smsValidation = require("./sms_validation");
+
+module.exports = {smsValidation}
\ No newline at end of file
diff --git a/server/backend_helper/sms_validation.js b/server/backend_helper/sms_validation.js
new file mode 100644
index 0000000..91c865d
--- /dev/null
+++ b/server/backend_helper/sms_validation.js
@@ -0,0 +1,25 @@
+// Download the helper library from https://www.twilio.com/docs/node/install
+// Set environment variables for your credentials
+// Read more at http://twil.io/secure
+const accountSid = process.env.TWILIO_ACCOUNT_SID;
+const authToken = process.env.TWILIO_AUTH_TOKEN;
+const client = require("twilio")(accountSid, authToken);
+
+const sendSms = async (number, verifySid) => {
+  return client.verify.v2
+  .services(verifySid)
+  .verifications.create({ to: number, channel: "sms" })
+  .then((verification) => verification);
+}
+
+const verify = async (number, verifySid, code) => {
+  return client.verify.v2.services(verifySid)
+      .verificationChecks
+      .create({to: number, code: code})
+      .then(verification_check => verification_check);
+}
+
+module.exports = {
+  sendSms,
+  verify
+}
\ No newline at end of file
diff --git a/server/index.js b/server/index.js
index 11dc253..49b6957 100644
--- a/server/index.js
+++ b/server/index.js
@@ -4,25 +4,14 @@ const express = require('express');
 const routes = require("./routes");
 const cors = require('cors');
 const morgan = require("morgan");
+const { default: mongoose } = require('mongoose');
 
 
 const uri = "mongodb+srv://" + process.env.MONGO_ADMIN_USERNAME + ":" + process.env.MONGO_ADMIN_PASSWORD + "@thi-cluster.hppzt17.mongodb.net/?retryWrites=true&w=majority";
 
-// Create a MongoClient with a MongoClientOptions object to set the Stable API version
-const client = new MongoClient(uri, {
-    serverApi: {
-        version: ServerApiVersion.v1,
-        strict: true,
-        deprecationErrors: true,
-    }
-});
-
 async function run() {  
     try {
-        // Connect the client to the server
-        await client.connect();
-        // Send a ping to confirm a successful connection
-        await client.db("admin").command({ ping: 1 });
+        await mongoose.connect(uri)
         console.log("Pinged your deployment. You successfully connected to MongoDB!");
         const app = express();
 
@@ -34,9 +23,8 @@ async function run() {
         app.listen(3000, () => {
             console.log(`Server started at ${3000}`);
         })
-    } finally {
-        // Ensures that the client will close when you finish/error
-        await client.close();
+    } catch (error) {
+        console.log(error);
     }
 }
 
diff --git a/server/package.json b/server/package.json
index 9ba7fa4..87f4094 100644
--- a/server/package.json
+++ b/server/package.json
@@ -6,7 +6,8 @@
     "mongodb": "^6.2.0",
     "mongoose": "^7.6.3",
     "morgan": "^1.10.0",
-    "nodemon": "^3.0.1"
+    "nodemon": "^3.0.1",
+    "twilio": "^4.19.0"
   },
   "scripts": {
     "start": "nodemon index.js"
diff --git a/server/routes/auth.js b/server/routes/auth.js
new file mode 100644
index 0000000..4e28f55
--- /dev/null
+++ b/server/routes/auth.js
@@ -0,0 +1,31 @@
+const express = require("express");
+require("dotenv").config();
+const router = express.Router();
+const {smsValidation} = require("../backend_helper");
+const serviceSid = process.env.TWILIO_SERVICE_SID;
+
+
+router.get("/sendSms", async (req, res, next) => {
+    try {
+        const {phoneNumber} = req.body;
+        const data = await smsValidation.sendSms(phoneNumber, serviceSid)
+        res.send(data);
+    } catch (error) {
+        res.status(400).json({message:error.message})
+    }
+})
+
+router.get("/verify", async (req, res, next) => {
+    try {
+        const {phoneNumber, code} = req.body;
+        const data = await smsValidation.verify(phoneNumber, serviceSid, code);
+        if (data.valid == false) throw new Error("Wrong SMS Code")
+        
+        // Valid SMS, do something...
+        res.send(data);
+    } catch (error) {
+        res.status(400).json({message:error.message})
+    }
+})
+
+module.exports = router
\ No newline at end of file
diff --git a/server/routes/index.js b/server/routes/index.js
index 0f23aa2..61913df 100644
--- a/server/routes/index.js
+++ b/server/routes/index.js
@@ -1,9 +1,12 @@
 const express = require("express");
 const resource = require("./resource");
 const organization = require("./organization");
+const auth = require("./auth");
+
 const router = express.Router();
 
 router.use("/resource", resource);
 router.use("/organization", organization);
+router.use("/auth", auth);
 
 module.exports = router;
\ No newline at end of file