Like many of you, I wanted to replace the Google Dialer with the native **ODialer** (Oppo/OnePlus Dialer) on OxygenOS 16 to get back the classic UI and native call recording features. However, it is often blocked or shows as incompatible in many regions.

I managed to get it working perfectly using Lucky Patcher to remove the license/region verification. Below is a step-by-step guide based on my experience, including how to fix the "Restricted Settings" error that prevents it from becoming the default phone app.

*(Disclaimer: I am not responsible for your device. This process involves modifying an APK. Ensure you backup your data.)*

### Prerequisites
* **ODialer APK:** Download the official APK (e.g., from APKMirror).
* **Lucky Patcher:** Installed on your device.

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### Part 1: Patching the App

1.  Open Lucky Patcher and find **ODialer** in the list.
2.  Tap on it and select **Menu of Patches**.
3.  Select **APK without License Verification**.
    * *[Image 1 and 2]*

4.  In the patch options, ensure **Auto Mode (dex)** is checked (usually the default).
5.  Tap **Rebuild The App**.
    * *[Image 3]*

6.  Wait for the patching to process. Once done, you will see a results screen (you should see green success patterns).
7.  Tap **Go to file**.
    * *[Image 4]*

8.  Select **Uninstall and install**.
    * *Note: This is necessary to replace the original signature with the patched one.*
    * *[Image 5]*

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### Part 2: The "Restricted Settings" Fix

After installing, when you try to set ODialer as your default phone app, Android will likely block it and show a warning: **"App was denied access to be default Phone app"** because of "Restricted Settings".

* *[Image 6]*

**Here is how to fix it:**

1.  Open your phone **Settings** -> **Apps** -> **App Management**.
2.  Find and tap on **ODialer** to open the App Info page.
3.  Tap the **three vertical dots** in the top right corner.
4.  Select **Allow restricted settings**. Verify with your fingerprint/PIN if asked.
    * *[Image 7]*

Now you can go back and successfully set ODialer as your default dialer. Native call recording and the OOS interface should work perfectly!

[Guide] How to use ODialer in unsupported countries/regions (OOS 16)