Not only for Samsung but for every phone released, software support for an older model is dropped. That’s the case with the Galaxy S21 series, which will stop receiving monthly security updates. The devices are still eligible for updates, but that will now come quarterly.

Samsung confirmed seven years of support for their flagship phones during the Galaxy S24 series unveiling last year. That ruled out the S21 series, meaning the device is eligible for five years of support only. Having debuted in January 2021, it’s now four years since the announcement, and as usual, Samsung will only send updates once every three months.
Meanwhile, we understand the trio – Galaxy S21, S21 Plus, and S21 Ultra, might still get a monthly patch before the quarterly patch takes effect. And if you are wondering, they will get that Android 15-based One UI 7 upgrade. Unfortunately, we do not know when Samsung plans to start rolling out the update, but it is coming.
The Galaxy S21 FE will continue receiving monthly security patches for another few months. This is because it arrived almost one year after the S21 series was unveiled. Nevertheless, we recommend looking for an upgrade, as it won’t be long before all the S21 models stop getting updates.
What happens when the Samsung Galaxy S21 series stops getting monthly security updates?
Once the phones are moved to quarterly updates, the end of their software support is near. You should consider getting a new Samsung phone, maybe the Galaxy S25, as it will be available for seven years. Of course, you can switch to custom ROM, but ensure you can find your way around that.