The Galaxy Note 10 and Note 10 Plus marked the end of Samsung’s support after being released in August 2019. The final security patch was provided in August 2023, making it a four-year support period.
Among Samsung’s early smartphone models, the Galaxy Note 10 was one of the first to receive three major OS upgrades (the first being the Galaxy S10, released in the same year). It came with Android 9 and concluded with Android 12.
Following that, Samsung extended the duration of security patch support to five years, starting with the Galaxy S21 and onwards.
Source: Android Central
TLDR: Samsung’s Galaxy Note 10 series received security updates for a total of four years, from its release in August 2019 to the final security patch in August 2023. It was one of the first Samsung phones to receive three major OS upgrades, starting with Android 9 and ending with Android 12. Samsung later expanded the support period to five years, beginning with the Galaxy S21.