Besides the method of rejecting an incoming call on the OnePlus smartphone with a short answer, we can also reject it directly by tapping and holding the handset icon and dragging it down.

In this case, no SMS message is sent, but the selected call diversion to a mailbox, for example, is active.

Note: Depending on the provider or network provider settings, the caller will only be informed that the subscriber is currently unavailable.

Android 10 | OxygenOS 10.0
Step 1:  Tap and hold the  green handset icon
Step 2:  Drag the  green handset icon  downwards
Step 3:  Release the  red handset icon  to reject the call
  1. Tap and hold the green handset icon
  2. Drag the green handset icon downwards
  3. Release the red handset icon to reject the call

OnePlus Instructions
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