My Face ID on the X did that. It was in my pocket during a torrential downpour. It got wet, and had to be replaced. Fortunately, it was covered under AppleCare.

Since you are running Beta software, you need to ask the Apple Beta Support Team.

iPhone is definitely better for older people. I helped my 82 year old father yesterday with his Android, and it is horrible. He also uses it to play music. He bought a brand new 2024 truck. The Android Auto is horrible. He must still use his phone screen to play music, as the app will not display his music library or playlists on the huge infotainment screen in the truck.

So, not only would an iPhone be better for his hearing and sight, it will also be much, much easier for him to use for every day usage.

Zigbee doesn’t use Wi-Fi.

Generally you will want to use a hub for your home automation. Most will use z-wave, zigbee and Wi-Fi. Some will also do Matter.

Using a smart home hub, you can have automation routines that tie all devices on various protocols together. The popular smart home hubs are Hubitat and Home Assistant.

No mater what you decide, home automation is not cheap. And, remember, you get what you pay for. Remember that. Lot of Wi-Fi devices require internet, and they communicate a lot with their manufacturers’ servers.

If you have a z-wave hub, then there are z-wave key fobs you could use to trigger a routine to flash lights, start a chime, or any other smart device.