Samsung isn't the only Android device maker promising monthly security updates in light of huge exploits like the Stagefright flaw. Google itself is vowing that Nexus devices will get monthly over-the-air patches, starting with software arriving today. If you own a Nexus 4 or any newer model, you won't have to wait ages for these fixes to come as part of a point release. The duration of update coverage remains the same. You'll get major OS updates for at least 2 years, and security fixes for either 3 years after launch or 18 months after your device leaves the Google Store.