diff --git a/android/app/src/main/res/layout/activity_main.xml b/android/app/src/main/res/layout/activity_main.xml
index eb007a3..4771469 100644
--- a/android/app/src/main/res/layout/activity_main.xml
+++ b/android/app/src/main/res/layout/activity_main.xml
@@ -50,7 +50,8 @@
                 android:id="@+id/defaultSimSlotRadioGroup"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
-                android:orientation="horizontal">
+                android:orientation="vertical"
+                >
             </RadioGroup>
         </LinearLayout>
     </LinearLayout>