If you don’t know How To Record A Phone Call On Iphone without installing any external application then follow these steps:-
1.Click the phone application to make a call on your iOS smartphone.
2. You can tap on the symbol that resembles a soundbar emoji in the upper left corner. An automated notification stating, "This Call Will Be Recorded," will show up on your call screen and be announced after a three-second countdown.
3. You can either hang the phone or just hit the record button to stop the call.