Phone App
You already have this app on your iPhone, but it’s important to remember that you can use the Phone app with CarPlay.
Like many other CarPlay apps, you can control it with your voice. Of course, you’ll be asking Siri to make or receive calls for you, but you can also control the Phone app with your screen, although it’s better to avoid doing this until you’re parked.
You can call anyone from your contacts or answer calls when you’re too busy paying attention to the road. Likewise, you can listen to your voicemail if you want to catch up on some missing messages.