Recording phone calls is a pretty straightforward process on Android, but that's not the case on iPhone. The App Store has some call recording apps, but we haven't found any that work in India. None of the call recording apps on the US App Store which actually work are free, so you're going to have to shell out some cash up-front if you want to record phone calls.
Now, recording phone calls is a bit of a grey area. We strongly advise against recording a phone call without permission. If you are recording a phone call, always let the person on the other end of the line know that you are doing so. You wouldn't record a video without permission, and the same basic principles apply to recording phone calls. There are several cases, such as telephonic interviews, when recording a phone call can be very useful. It could even be to record a recipe that someone narrates over the phone or a set of instructions that you know you'll forget. As long as the other person is fine with you recording the call, you're good to go.
Watch the video for the full guide.