Yes they definitely have! I have received security updates on a monthly basis since I purchased my AT&T Note 5 when it was first released. My GF has also received monthly security updates on her AT&T S6. I personally think security updates are far more important then software updates. We are both eagerly awaiting the release of the S8 as we both will be getting one.This is great. They are on top of these security updates as of late.