Bob wants to know to record his phone calls on his iPhone. Leo says you can't directly. Apple doesn't give you access to the phone app. Plus, there are larger legal issues that may be in play in your state that would require you to secure permission for recording. However, you can use a third-party app calls Record a Call, What's App, and others. There are plenty that requires merging the call. On Android, it's a lot easier. Call Recorder is one. Check out this link on the best apps for Android - https://www.androidauthority.com/best-call-recorder-apps-android-1001838/.