Hello everyone,
Many Samsung users face the issue where dialing #0# does not open the Test Mode / Diagnostic Menu.
I recently discovered the cause:
The Auto Blocker feature in Samsung settings is blocking the code.
Fix Method:
Go to Settings > Security & Privacy > Auto Blocker
Turn Off Auto Blocker
Dial #0# → Test Mode will now open successfully.
If you turn Auto Blocker ON again, the code will stop working.
here is Full Article about How to enable or disable test mode .. pros & cons .
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Here’s the full step-by-step video guide:
This method is tested on multiple Samsung devices (S Series, A Series, Note, Z Flip/Fold, etc.) and works perfectly without root or extra tools.
If this fix works for you, kindly reply with your Samsung model—it may help others.
Thanks,