Samsung has being worked closely with its OS and chipset partners, as well as over 200 carriers around the world to ensure that billions of Galaxy devices receive timely security patches. Based on this, Samsung releases monthly and quarterly firmware security updates on selected Samsung devices. But, availability of security update support may vary by device and market. Also, some carriers may only support quarterly updates for all applicable current models
any delay in delivering the security patch updates due to improvements on the update to make your experience with Samsung devices more secure
