Samsung Electronics has discontinued support for smartphones Galaxy S6, Galaxy S6 edge and Note 5. Recently they received the latest security update and more for they will not produce updates FOR.
Samsung provides the software support for their smartphones at least two years. However, for security updates, the Korean manufacturer has promised a three-year support for all flagship and many models of secondary and primary level.
Smartphones Samsung Galaxy S6, S6 edge and Galaxy Note 5 was released in 2015, so this step is quite natural.
Note that in April Samsung removed from the list of devices that Samsung releases updates Android security, smartphone Galaxy S6. But the next day it returned Galaxy S6 and Galaxy S6 edge. Now support for them ceased. The same fate befell the Galaxy Note 5.