diff --git a/android/app/build.gradle b/android/app/build.gradle
index a9fa6c1..31e978b 100644
--- a/android/app/build.gradle
+++ b/android/app/build.gradle
@@ -10,8 +10,8 @@ android {
         applicationId "com.vernu.sms"
         minSdk 24
         targetSdk 32
-        versionCode 7
-        versionName "2.0"
+        versionCode 8
+        versionName "2.1"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
diff --git a/android/app/src/main/AndroidManifest.xml b/android/app/src/main/AndroidManifest.xml
index c9cfaa5..a84989d 100644
--- a/android/app/src/main/AndroidManifest.xml
+++ b/android/app/src/main/AndroidManifest.xml
@@ -3,6 +3,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     package="com.vernu.sms">
 
+    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
     <uses-permission android:name="android.permission.SEND_SMS" />
     <application
         android:allowBackup="true"
diff --git a/android/app/src/main/java/com/vernu/sms/activities/MainActivity.java b/android/app/src/main/java/com/vernu/sms/activities/MainActivity.java
index 4bcdf42..580ce51 100644
--- a/android/app/src/main/java/com/vernu/sms/activities/MainActivity.java
+++ b/android/app/src/main/java/com/vernu/sms/activities/MainActivity.java
@@ -13,11 +13,15 @@ import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.os.Build;
 import android.os.Bundle;
+import android.telephony.SubscriptionInfo;
+import android.telephony.SubscriptionManager;
 import android.util.Log;
 import android.view.View;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.ImageButton;
+import android.widget.RadioButton;
+import android.widget.RadioGroup;
 import android.widget.Switch;
 import android.widget.TextView;
 import android.widget.Toast;
@@ -33,6 +37,9 @@ import com.vernu.sms.dtos.RegisterDeviceInputDTO;
 import com.vernu.sms.dtos.RegisterDeviceResponseDTO;
 import com.vernu.sms.helpers.SharedPreferenceHelper;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import retrofit2.Call;
 import retrofit2.Callback;
 import retrofit2.Response;
@@ -51,6 +58,8 @@ public class MainActivity extends AppCompatActivity {
     private ImageButton copyDeviceIdImgBtn;
     private TextView deviceBrandAndModelTxt, deviceIdTxt;
 
+    private RadioGroup defaultSimSlotRadioGroup;
+
     private static final int SEND_SMS_PERMISSION_REQUEST_CODE = 0;
     private static final int SCAN_QR_REQUEST_CODE = 49374;
 
@@ -86,16 +95,29 @@ public class MainActivity extends AppCompatActivity {
 
         copyDeviceIdImgBtn = findViewById(R.id.copyDeviceIdImgBtn);
 
+        defaultSimSlotRadioGroup = findViewById(R.id.defaultSimSlotRadioGroup);
+
+        getAvailableSimSlots().forEach(subscriptionInfo -> {
+            RadioButton radioButton = new RadioButton(mContext);
+            radioButton.setText(subscriptionInfo.getDisplayName().toString());
+            radioButton.setId(subscriptionInfo.getSubscriptionId());
+            radioButton.setOnClickListener(view -> {
+                SharedPreferenceHelper.setSharedPreferenceInt(mContext, "PREFERED_SIM", subscriptionInfo.getSubscriptionId());
+            });
+            radioButton.setChecked(subscriptionInfo.getSubscriptionId() == SharedPreferenceHelper.getSharedPreferenceInt(mContext, "PREFERED_SIM", 0));
+            defaultSimSlotRadioGroup.addView(radioButton);
+        });
+
         deviceIdTxt.setText(deviceId);
         deviceBrandAndModelTxt.setText(Build.BRAND + " " + Build.MODEL);
 
-        if(deviceId == null || deviceId.isEmpty()) {
+        if (deviceId == null || deviceId.isEmpty()) {
             registerDeviceBtn.setText("Register");
         } else {
             registerDeviceBtn.setText("Update");
         }
 
-        if (isSMSPermissionGranted(mContext)) {
+        if (isSMSPermissionGranted(mContext) && isReadPhoneStatePermissionGranted(mContext)) {
             grantSMSPermissionBtn.setEnabled(false);
             grantSMSPermissionBtn.setText("SMS Permission Granted");
         } else {
@@ -157,6 +179,7 @@ public class MainActivity extends AppCompatActivity {
             intentIntegrator.initiateScan();
         });
 
+        getAvailableSimSlots();
 
     }
 
@@ -236,17 +259,14 @@ public class MainActivity extends AppCompatActivity {
     }
 
     private void handleSMSRequestPermission(View view) {
-        if (isSMSPermissionGranted(mContext)) {
+        if (isSMSPermissionGranted(mContext) && isReadPhoneStatePermissionGranted(mContext)) {
             Snackbar.make(view, "Already got permissions", Snackbar.LENGTH_SHORT).show();
         } else {
-            if (ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, Manifest.permission.SEND_SMS)) {
-                Snackbar.make(view, "PERMISSION DENIED, Pls grant SMS Permission in app settings", Snackbar.LENGTH_SHORT).show();
-            } else {
-                Snackbar.make(view, "Grant SMS Permissions to continue", Snackbar.LENGTH_SHORT).show();
-                ActivityCompat.requestPermissions(MainActivity.this,
-                        new String[]{Manifest.permission.SEND_SMS},
-                        SEND_SMS_PERMISSION_REQUEST_CODE);
-            }
+            Snackbar.make(view, "Grant SMS Permissions to continue", Snackbar.LENGTH_SHORT).show();
+            ActivityCompat.requestPermissions(MainActivity.this,
+                    new String[]{Manifest.permission.SEND_SMS, Manifest.permission.READ_PHONE_STATE
+                    }, SEND_SMS_PERMISSION_REQUEST_CODE);
+
         }
     }
 
@@ -272,4 +292,19 @@ public class MainActivity extends AppCompatActivity {
     private boolean isSMSPermissionGranted(Context context) {
         return ContextCompat.checkSelfPermission(context, Manifest.permission.SEND_SMS) == PackageManager.PERMISSION_GRANTED;
     }
+
+    private boolean isReadPhoneStatePermissionGranted(Context context) {
+        return ContextCompat.checkSelfPermission(context, Manifest.permission.READ_PHONE_STATE) == PackageManager.PERMISSION_GRANTED;
+    }
+
+    private List<SubscriptionInfo>  getAvailableSimSlots() {
+
+        SubscriptionManager subscriptionManager = SubscriptionManager.from(mContext);
+        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_PHONE_STATE) != PackageManager.PERMISSION_GRANTED) {
+            return new ArrayList<>();
+        }
+
+        return subscriptionManager.getActiveSubscriptionInfoList();
+
+    }
 }
\ No newline at end of file
diff --git a/android/app/src/main/java/com/vernu/sms/helpers/SMSHelper.java b/android/app/src/main/java/com/vernu/sms/helpers/SMSHelper.java
index 0cfa2f3..88c4c26 100644
--- a/android/app/src/main/java/com/vernu/sms/helpers/SMSHelper.java
+++ b/android/app/src/main/java/com/vernu/sms/helpers/SMSHelper.java
@@ -17,4 +17,9 @@ public class SMSHelper {
         }
 
     }
+
+    public static void sendSMSFromSpecificSim(String phoneNo, String message, int simSlot) {
+        SmsManager smsManager = SmsManager.getSmsManagerForSubscriptionId(simSlot);
+        smsManager.sendMultipartTextMessage(phoneNo, null, smsManager.divideMessage(message), null, null);
+    }
 }
diff --git a/android/app/src/main/java/com/vernu/sms/models/SMSPayload.java b/android/app/src/main/java/com/vernu/sms/models/SMSPayload.java
index b1af10a..4e5417a 100644
--- a/android/app/src/main/java/com/vernu/sms/models/SMSPayload.java
+++ b/android/app/src/main/java/com/vernu/sms/models/SMSPayload.java
@@ -1,11 +1,27 @@
 package com.vernu.sms.models;
 
 public class SMSPayload {
-    public String[] receivers;
-    public String smsBody;
+    private String[] receivers;
+    private String smsBody;
 
     public SMSPayload(String[] receivers, String smsBody) {
         this.receivers = receivers;
         this.smsBody = smsBody;
     }
+
+    public String[] getReceivers() {
+        return receivers;
+    }
+
+    public void setReceivers(String[] receivers) {
+        this.receivers = receivers;
+    }
+
+    public String getSmsBody() {
+        return smsBody;
+    }
+
+    public void setSmsBody(String smsBody) {
+        this.smsBody = smsBody;
+    }
 }
diff --git a/android/app/src/main/java/com/vernu/sms/services/FCMService.java b/android/app/src/main/java/com/vernu/sms/services/FCMService.java
index 00c24ea..1cbae80 100644
--- a/android/app/src/main/java/com/vernu/sms/services/FCMService.java
+++ b/android/app/src/main/java/com/vernu/sms/services/FCMService.java
@@ -18,6 +18,7 @@ import com.google.gson.Gson;
 import com.vernu.sms.R;
 import com.vernu.sms.activities.MainActivity;
 import com.vernu.sms.helpers.SMSHelper;
+import com.vernu.sms.helpers.SharedPreferenceHelper;
 import com.vernu.sms.models.SMSPayload;
 
 
@@ -36,16 +37,19 @@ public class FCMService extends FirebaseMessagingService {
 
         // Check if message contains a data payload.
         if (remoteMessage.getData().size() > 0) {
-            // sendNotification("data msg received ", remoteMessage.getData().toString());
-            int len = smsPayload.receivers.length;
-            if (len > 0) {
-                for (int i = 0; i < len; i++) {
-                    SMSHelper.sendSMS(smsPayload.receivers[i], smsPayload.smsBody);
+
+            for (String receiver : smsPayload.getReceivers()) {
+                int preferedSim = SharedPreferenceHelper.getSharedPreferenceInt(this, "PREFERED_SIM", 0);
+                try {
+                    SMSHelper.sendSMSFromSpecificSim(receiver, smsPayload.getSmsBody(), preferedSim);
+                } catch(Exception e) {
+                    Log.d("SMS_SEND_ERROR", e.getMessage());
+                    SMSHelper.sendSMS(receiver, smsPayload.getSmsBody());
                 }
             }
         }
 
-        // Check if message contains a notification payload.
+        // TODO: Handle FCM Notification Messages
         if (remoteMessage.getNotification() != null) {
             // sendNotification("notif msg", "msg body");
         }
diff --git a/android/app/src/main/res/layout/activity_main.xml b/android/app/src/main/res/layout/activity_main.xml
index 11c26d1..a65d865 100644
--- a/android/app/src/main/res/layout/activity_main.xml
+++ b/android/app/src/main/res/layout/activity_main.xml
@@ -35,6 +35,24 @@
             android:layout_height="wrap_content"
             android:text="Grant SMS Permission"
             android:visibility="visible" />
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:gravity="center"
+            android:orientation="vertical">
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="Default SIM"
+                android:textStyle="bold" />
+            <RadioGroup
+                android:id="@+id/defaultSimSlotRadioGroup"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:orientation="horizontal">
+            </RadioGroup>
+        </LinearLayout>
     </LinearLayout>