that goes as follows:
Opens: homescreen -> apps menu -> Settings -> Applications -> News
You now find yourself in the special message settings of your Samsung Galaxy S7. tap on "Advanced Settings" to go to the next submenu. Here you must now turn off the switch at the following location:
Delete old messages
If off, then on the smartphone delete all SMS from now, when the max. Number of 1000 is exceeded. We hope that you therefore do not lose valuable SMS messages on the Samsung Galaxy S7 and can maintain your collection.