Let the user know they need to enable DSDS on some devices

app/src/main/res/layout/activity_main.xml

@@ -18,6 +18,9 @@
             android:id="@+id/no_euicc_placeholder"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
+            android:layout_marginStart="40dp"
+            android:layout_marginEnd="40dp"
+            android:gravity="center"
             android:text="@string/no_euicc" />
     </FrameLayout>
 

app/src/main/res/values/strings.xml

@@ -1,7 +1,7 @@
 <resources>
     <string name="app_name">OpenEUICC</string>
 
-    <string name="no_euicc">No eUICC found on this device.</string>
+    <string name="no_euicc">No eUICC found on this device.\nOn some devices, you may need to enable dual SIM first in the menu of this app.</string>
 
     <string name="dsds">Dual SIM</string>