How do I take a screenshot of an active phone call without hanging up? I'm trying to take a screenshot of the "hard-pause" dialing feature. If you put a semicolon after a phone number you can provide, for example, a conference line pass-code as part of a phone number.

1-800-123-4567;987654#


The call screen then shows a little clickable label in the bottom left-hand side of the call screen to appear

Dial "9876..."


I try to screenshot that, but pressing the home button causes the call to end and I get a screenshot of the hanging up call screen.
Use Assistive Touch, available from Settings → Accessibility → Assistive Touch.

Enable the feature using the switch, then take a screenshot by pressing the Assistive Touch button, then Device → More → Screenshot.