Ultra Call Recorder (Free)

Ultra Call Recorder is your tool to record any phone call you want and automatically get it saved. Listen to the recording, add notes, mark as favourites and email it.
If you encounter any recording issues or wish to improve voice quality, try recording from a different audio source, or use auto-on speaker mode.
Recorded calls are stored in the Inbox. The number of saved calls is limited only by your device memory. If you decide that a conversation is important, you can keep it, otherwise you can directly delete it to free space, you can set automatic data cleaning to delete old recordings periodically, you can also choose the format of the recordings whether 3gp or mp4.