A free program for Android, by WorldClass.

Automatic Call Recorder – Auto is an application that allows you to make and record national or international calls from any Android device including tablets. The application is based on a technology that allows calls to be recorded automatically, while the phone is in use. This application is simple to use and is hidden behind a clever intuitive user interface. It is built to be a versatile utility that can be used on multiple devices and platforms.

How does it work?

The application is capable of recording calls in a variety of formats. The recordings are subsequently stored on the device and can be played back or downloaded.

The user interface is designed to be intuitive and easy to use. No fumbling or questioning how to start recording automatically.