The simple and best way to recover lost SMS from Samsung Galaxy Note 8 is by using a recovery tool such as
Samsung Phone Data Recovery [androiddata-recovery.com]. This is easy to use and all your lost SMS are recovered without any backup. With few steps, all your lost SMS will be restored. Using it, not only SMS but other data are also retrieved such as photos, videos, WhatsApp, call logs, contacts and others. But also remember that the software will work successfully when the deleted data is not overwritten with any new files.