Option-A:

1. If you have removed application then install “Calculator Pro+” again.
2. Open application and go to Settings.
3. Go to Backup and Restore Messages.
4. Click on “Restore Messages”.
5. Select latest backup from list. (It takes auto backup on every week, you can restore
   latest backup)

Option-B:

1. If you have application already installed and want to move messages back to native application.
2. Open application.
3. Long press on conversation or contact
4. Select “Modify Contact”
5. Now click on “Delete Contact” which will give you option to move your messages to native
   application.