Hello! To transfer installed apps from your phone to the SD card on your Oppo A16, you can follow these steps:
1. Go to "Settings" on your Oppo A16.
2. Scroll down and find the "Apps & Notifications" or "Apps" option.
3. Look for the app you want to transfer to the SD card. Tap on the app.
4. Inside the app info page, you should see an option that says "Storage." Tap on it.
5. If the app is movable to the SD card, you will see an option that says "Change" or "Storage used." Tap on it.
6. A pop-up window will appear, giving you the option to change the storage location. Select "SD card" or "SD card storage."
7. Follow the on-screen instructions to complete the transfer of the app to the SD card.
Please note that not all apps can be transferred to the SD card, as some apps are designed to run only from the internal storage of the device. Additionally, moving apps to the SD card may cause them to run slower than when they are stored on the internal storage.
I hope this helps! Let me know if you have any other questions.