iPhone

Hello and welcome to Apple Support Communities, JBR1222,

If we understand your post correctly, you're looking for Theater Mode on your iPhone. We’d like to help.

Theater Mode is available on Apple Watch: Use Control Center on your Apple Watch - Apple Support

For your iPhone you can use silent mode or Do Not Disturb with Focus:

How to put your iPhone on vibrate, ring, or silent mode - Apple Support

Use Do Not Disturb with Focus on your iPhone or iPad - Apple Support

Turn on Do Not Disturb

1. Go to Settings > Focus.

2. Tap Do Not Disturb.

3. Under Turn on Automatically, set Do Not Disturb to turn on automatically at a certain time, location, or while using a certain app.

To turn on Do Not Disturb from Control Center:

1. Open Control Center on your iPhone or iPod touch, or on your iPad. 

2. Touch and hold Focus, then tap Do Not Disturb.

Let us know if that resolves this issue for you.

Thanks for using the Apple Support Communities.