How to delete voice or video call from call history on Facebook Messenger
To delete voice or video call from your call history in Messenger, do this:
iPhone or iPad:
1. From your Messenger homepage, you’ll need to tap Calls in the top right
2. Next, swipe left on the call you want to delete
3. Finally, tap Delete
Android:
1. From home, tap Calls in the top right
2. Next, tap and hold the call you want to delete
3. Finally, tap Delete from recent calls
See: Here’s How to Deactivate FB account temporarily | Close Facebook Account Now!