How to turn on Auto Blocker on a Samsung Galaxy phone

By Saadat Rafiq · 2 min read · 5 steps · Updated 5 October 2026

Device

Android

Shown on

Samsung Galaxy A57 5G (SM-A576B), One UI 8.5, Android 16

App

Settings

Path

Settings › Security and privacy › Auto Blocker

Real screenshots

4 of 5 steps

Checked

October 2026

Sources

1 official, linked below

Step by step

1. 

   Open Security and privacy

   Open Settings and tap Security and privacy.

   Done

2. Tap Auto Blocker

   It is near the top of the Security and privacy page.

   Done

3. 

   Switch it on

   Tap the switch next to Off so it turns blue.

   Done

4. 

   Know what it blocks

   Apps from sources other than the Play Store or Galaxy Store, commands from chargers or computers over USB, suspicious images in messaging apps, and software updates not certified by Samsung.

   Done

5. 

   Check Turn on automatically

   If you switch Auto Blocker off, for example to install an app from a website, this option turns it back on by itself 30 minutes later.

   Done

About this guide

Auto Blocker is Samsung's one-switch protection against the most common ways malware gets onto a phone. It was switched off on our phone. It needs One UI 6 or later.

The screenshots are from a Samsung Galaxy A57 5G with One UI 8.5 and Android 16. Other Galaxy phones on One UI 8 use the same menus; on older One UI versions a few names and positions differ. We only looked at these screens on our phone and changed nothing.

Good to know

To install an app from outside the stores you have to switch Auto Blocker off first. Do that only for an app you trust.

A USB cable for charging still works. Only data commands are blocked.

In short: Settings, Security and privacy, Auto Blocker, switch on. Turn on automatically brings it back after 30 minutes.