Install @t Filter

Pick the device to protect and follow the steps. You need an installation code: it links the device to your household.

Which kind of Android phone?

Allow "Install unknown apps" for your browser, and set AT Filter's battery to "No restrictions".

Android phone or tablet

Install the AT Filter app on the phone (no reset needed). Download
Open AT Filter and enter this code:
YOUR-CODE
Tap “Turn on the filter” and accept the VPN connection request. AT Filter Video also appears on the home screen.
Still in AT Filter, follow “Simple protection”: “Always-on VPN” and “Block connections without VPN”, then uninstall protection. If the filter is turned off, you will see it here.

Steps for other Android phones

Allow "Install unknown apps" for your browser when Android asks.
Install the app, enter the code and accept the VPN request.
If Accessibility is greyed out: Settings → Apps → AT Filter → ⋮ → "Allow restricted settings".
Battery: set AT Filter to "No restrictions" so the filter stays on.

Xiaomi, Redmi, Poco (MIUI / HyperOS)

Settings → Apps → Permissions → Autostart: turn AT Filter on.
Settings → Battery → AT Filter → "No restrictions" (MIUI battery saver off).
In recent apps, lock AT Filter (long press, padlock) so MIUI does not close it.
Settings → Apps → AT Filter → Other permissions: enable "Display pop-up windows while running in the background".

Full protection (optional): for a phone that must never be unlocked, factory-reset it and install AT Filter at first start-up. The AT Filter team will guide you.

Full protection by USB cable (optional, non-Samsung)

For a phone that must never be able to uninstall AT Filter. One USB cable, once, from Chrome or Edge on a computer. No account is removed and nothing is erased.

Prepare the phone

Enable developer options: Settings → About phone → tap "Build number" 7 times.
In developer options, turn on "USB debugging".
Plug in the cable and accept "Allow USB debugging?" on the phone.
Close any "adb" program running on the computer (it would block access).

Pick "File transfer" as USB mode if the phone does not appear.

What will happen

AT Filter is installed on the phone.
AT Filter becomes the device owner (Device Owner): no uninstall without your consent.
If Android refuses because accounts exist, the sign-in components of those accounts are disabled for a few seconds, then re-enabled right away. Nothing is erased. You will see the exact list first and be asked to agree.

In your browser

The AT Filter extension blocks adult sites and enforces SafeSearch in the browser, even without the app. Pick yours.

Finally: check

When the device is linked, it shows in your console as "Filter on". Tick as you go:

The AT Filter app is installed and the install code entered.
The filter is on (VPN request accepted).
Device administrator and Accessibility are enabled.
The device appears in the management console, status "Filter on".

Open the console to check

Get my installation code

Enter the email address of your @t Filter account: we send you a code valid for 2 hours.

No account yet? Create my household