This method might be helpful especially on Android 9 Pie if your device has system built-in call recording function.

In this case, the app itself won't do recording. But the app will import files from the folder where the system built-in call recording app stores its files.

FAQ

How to enable built-in call recording?

Not any phone supports built-in call recording, but if your device supports it, these settings are usually placed in Phone app or in Sound Recorder app.

How does this method work?

1. You select folder in Settings → Recording → System Recorder
2. The app will import any new file created in that folder during a call

Does my Samsung device supports it?

Samsung has disabled call recording function for most countries. But if you have device from one of the following countries, it should have call recording feature: Thailand (SPay), Vietnam (SPay), India (SPay), Israel, Algeria, Bangladesh, Libya, Egypt, Laos, Nepal, Sri Lanka and Tunis. If you'd like to change region, you need to change CSC code of your device. Search how to do it for your device.