If you don't use 5G on your iPhone 12, do yourself a favor and turn it off. Here's how - CNET

We'll also show you how to control when and how much 5G data your new iPhone uses.

All four iPhone 12 models -- the iPhone 12 Mini, iPhone 12, iPhone 12 Pro and iPhone 12 Pro Max -- support 5G wireless connections.

To be clear, Apple has built a new Smart Data feature into the iPhone 12's software that only uses a 5G connection when you're doing something that requires it -- like streaming a video or playing a game on a cellular connection.

Open the Settings app then go to Cellular > Cellular Data Options > Voice & Data and tap LTE.

Or if you'd rather your iPhone 12 not use Apple's Smart Data mode, you can force it to always use a 5G connection when available by selecting 5G On. .

Go to Settings > Cellular > Cellular Data Options > Data Mode on your iPhone