Galaxy phones can fully block internet access for individual apps with this new One UI 9 setting
Samsung’s latest One UI 9 rollout introduces a hidden toggle that lets Galaxy owners cut off internet access for any single app, a capability that directly impacts how users manage data leakage and unwanted background traffic.
One UI 9’s per‑app internet toggle: how it works
The new setting lives inside the app‑info screen, where users can find a switch labeled “Allow background data.” Activating it disables all network sockets for that app, effectively isolating it from Wi‑Fi and cellular connections. This operates at the OS level, so the app never receives a network request, regardless of its internal permissions.
Because the toggle is implemented in the Android framework, it does not rely on third‑party firewalls or VPNs; the system kernel simply drops outbound packets for the selected UID. The result is a binary “on/off” state that cannot be overridden by the app without explicit user re‑enablement, ensuring a robust barrier against hidden data calls.
Privacy leverage: limiting data exposure per app
When an app cannot reach the internet, any telemetry, ad‑serving, or location‑tracking code is rendered inert. Users can therefore keep essential utilities—like a calendar or notes app—online while sealing off social media or gaming apps that are prone to aggressive data harvesting. This granular control is a step beyond the traditional “restrict background data” option, which only throttles usage rather than blocking it outright.
From a threat‑model perspective, the per‑app block reduces the attack surface for both malicious code and over‑privileged legitimate apps. Even if an app is compromised, the attacker cannot exfiltrate data without first convincing the user to lift the restriction, adding a human decision point to the security chain.
Rollout reality: limited availability and hidden placement
One UI 9 is still in a phased deployment, with Samsung pushing the update to “more devices in more regions” gradually. Early adopters report that the setting is “so hidden” that many users who have been on One UI 9 for weeks still miss it. The concealment appears intentional, likely to avoid overwhelming casual users with a feature that could break app functionality if misused.
Because the rollout is not universal, a sizable portion of the Galaxy ecosystem remains on older UI versions lacking this capability. Consequently, the privacy benefit is uneven, and users must verify their device’s update status before attempting to use the toggle.
What This Actually Means For You
- Control data flow on a per‑app basis without installing extra software.
- Mitigate privacy risks from apps that collect telemetry by simply turning off their network access.
- Understand that the feature is hidden; you’ll need to navigate to each app’s info page to locate the toggle.
- Check your device’s software version; only One UI 9 recipients have the option.
- Be prepared to re‑enable internet for apps that depend on cloud sync or updates, or they will stop functioning.
Immediate Action Steps
First, confirm you are running One UI 9 by opening Settings → About phone and checking the software version. If the update is present, open Settings → Apps, select the target app, tap “App details in store,” then scroll to the “Allow background data” switch and toggle it off.
After disabling, monitor the app’s behavior; if essential features stop working, revisit the same screen and re‑enable the toggle. Repeat the process for any additional apps you wish to isolate, keeping a short list for future reference.
Frequently Asked Questions
How do I find the One UI 9 internet block setting for an app?
The toggle is located in the app’s info screen under Settings → Apps; look for the “Allow background data” switch, which now functions as a full internet block.
Does the per‑app block work on Wi‑Fi and mobile data?
Yes, the setting disables all network interfaces for the selected app, preventing both Wi‑Fi and cellular connections.
What if my Galaxy phone hasn’t received One UI 9 yet?
Without the update, the per‑app internet block is unavailable; you’ll need to wait for Samsung’s phased rollout or consider alternative firewall apps.
What Do You Think?
Given the trade‑off between privacy and app functionality, should Samsung make this per‑app internet block more visible to encourage broader adoption?