It can happen that you receive on your Samsung Galaxy S6 CB messages by your operator. CB stands for Cell Broadcast. You will receive a CB message whenever, your dials in a cell (cell towers) and holds Samsung Galaxy S6 this a CB message. So by CB News local information or advertising can be sent to the customer.
Would you like to get on the Samsung Galaxy S6 no CB-messages, you can turn off this feature as follows:
Open from the Home Screen:
Menu -> Settings -> Applications -> News -> Advanced settings
In this submenu you can now find Android menu item "Cell Broadcast". Typed on the entry and you can then disable the slider to adjust the top-right next submenu this option.
Subsequently you any messages on the Samsung Galaxy S6 Cell Broadcast sent.