Why can't I copy my iPhone's call captions?
You use live captions to follow a call, then want to copy the delivery instructions. Being able to read the words doesn't necessarily mean you can save them. Apple's existing iPhone guide says Settings → Accessibility → Live Captions → Keep Call Captions has two options. With ‘1 Minute’, call captions are kept for up to a minute during the call and cleared when it ends. Copying, screenshots and screen recordings of the call transcription aren't available. With ‘1 Hour’, captions remain available for up to an hour after the call ends, and those copying and capture options are available. All participants hear ‘This call is being transcribed’ at the start of the call. I'd want those consequences written beside the choice, not just the two durations. Someone trying to copy an address is also changing how long call text stays available and what the other caller hears. Don't choose the longer setting simply because it sounds like a bigger scrollback. Check it before a call where you expect to need the text afterward. This is documented behavior, not a phone test I've run or a newly announced feature. Apple lists iPhone 11 or later, with language and region limits, and warns against relying on caption accuracy in emergencies or other high-risk situations.
Comments
For a delivery address, I'd ask the caller to send it in a text message first, if they can. They can check the spelling and postcode before sending; you get the detail you need without changing how long the call's captions stay available. That won't replace captions for following the conversation, and it isn't an option with every caller. I'd try that before changing a call-retention setting just to keep one address.