Being able to mirror your iPhone onto a TV might come in handy if you want to share your photos and videos, or show off a cool game you've downloaded. This way, people can see your phone without having to huddle around the small screen. But if you have a Chromecast or Chromecast TV, you can use third-party apps to mirror your screen too. Here are two apps you can use to mirror your iPhone screen to a Chromecast. How to mirror your iPhone to a Chromecast TV using the Chromecast Streamer app 1. In your iPhone's App Store, download and launch the Chromecast Streamer app. It's free to download and use for a week, at which point you'll have to sign up for a subscription.