Samsung recently started sending Android 9 Pieces to Galaxy S8 and S8 +. But this update seems to have caused a big problem.
It seems that many can not connect to 4G / LTE after sending Android 9 Galaxy S8 and S8 +. In addition, the Samsung Galaxy Note 8 seems to be hit by the problem. I hope Samsung works to solve the problem.
However, it remains to be seen how you will join that stuff.