How to enable and use Siri on any iPhone X model in 2 different ways

You can use Siri on an iPhone XR, iPhone XS, or iPhone X in two ways: either with the Side button, or through a "Hey Siri" voice command.

How to get Siri's new look in iOS 18.3

The familiar orb at the bottom of your screen is now a thing of the past. Update your iPhone to get a glowing, colorful border when you summon Siri.