Some phones do not support call recording properly. This is due to capabilities of different chipset/CPU or Android version each brand/model have.
Legal: We are not lawyers. Recording calls without letting your caller know may not be legal in some countries, or states.
In order to comply with new Google Play Store policy ACR is no longer have CALL LOG permission. This means all calls will be saved as “Unknown”, call filters such as Excluded and Included numbers will cease to work. You can use “Edit number” option to rename calls.