On iPhone, in the Home app, you can control your accessories even when you’re away from home. To do so, you need a home hub, a device such as Apple TV 4K or HomePod. In fact, if you’re signed in to the same Apple Account on it, it’s set up automatically as a home hub.
Go to Settings > [your name] > iCloud, tap See All, then turn on Home.
You must be signed in to the same Apple Account on your home hub device and your iPhone.
If you have an Apple TV 4K or HomePod, and you’re signed in to the same Apple Account as your iPhone, it’s set up automatically as a home hub.
