According to recent reports, Samsung are about to release 2 new phones with the model numbers SM-G770F and SM-N770F. Due to their similarity to those of the Galaxy S10 and Note 10 respectively, it is now believed that they are budget versions of these phones. The SM-G770F is said to have the same specs as the Galaxy A91.
https://www.notebookcheck.net/Samsung-may-release-further-budget-versions-of-the-S10-and-Galaxy-Note-10.438767.0.html