How to Set up call announcements
Dig into Settings
If you want Siri to announce who is calling you whenever your iPhone rings, then you need to go to the top level of the Settings app. In the fifth group of features down, which begins Accounts & Passwords, tap Phone.
Make your choice
There are four possible behaviors. You can get your iPhone to always announce whenever an incoming call is received. With Always selected, caller announcements can play through your iPhone’s built-in speaker.
Use with headphones
The car option also announces calls through your headphones. If you want Siri to announce calls only when you’re using headphones, not when your car’s hands-free system is connected, pick Headphones Only.
Find the correct option
The option you want on the item settings page is the very first one under the Calls heading: Announce Calls, which has Never next to it by default. Tap that option to see the other available choices.
Use in a car
Select “Headphones & Car” and Siri can announce callers through your car’s Bluetooth audio system. You can’t enable announcements for the car only and not your headphones. This is so that it works with hands-free headsets.
Accepting a call
Now when your iPhone rings, provided it is not muted, Siri will speak to tell you who is calling, so you won’t have to pick up (or even glance at) your phone to find out. Either accept or decline, or let it ring out to voicemail.