human
How do I record a WhatsApp call on my iPhone?
assistant
Record WhatsApp Calls on iPhone or iPad
1. Download "Rec Screen Recorder" from the App Store.
2. Open your Settings menu.
3. Tap Control Center, and then Customize Controls.
4. Tap the green "+" next to "Screen Recording." 
5. Open WhatsApp.
6. Swipe up from the bottom, and hold down the white dot icon .
7. Select Rec, tap the gray mic icon, and tap Start Broadcasting.
8. Make your WhatsApp call.
9. Tap the red banner at the top, and select Stop to finish.