Using a USB-C cable and USB-C charger will allow the iPhone to charge at faster speeds. Using USB-C, you can charge the iPhone to 50% in about half an hour. The highest wattage the iPhone 12 will use is around 22 watts, so a 20 watt or 30 watt charger will result in the about same charging speed.

Why does the iPhone 12 come with a USB-C cable?

Apple's decision to ship a USB-C to Lightning cable means more users can now go this route without making an additional purchase. ... Your older iPhone's Lightning cable will work with your iPhone 12. For iPhone 11 Pro/Pro Max customers, this means being able to use the 18W USB-C Power Adapter that came with your device.

Is iPhone 12 Charger Lightning or USB-C?

Every iPhone 12 comes with a Lightning-to-USB-C cable, and that's pretty much it. So out of the box, those who don't currently have any Apple power adapters will need a USB-C power adapter to charge the iPhone 12.