The iPhone 15 is compatible with two types of external monitors: USB-C and HDMI. On displays that support USB-C DisplayPort protocol, Apple recommends using a USB 3.1 or higher cable for getting up to 4K resolution and 60Hz refresh rate (with HDR).
This could be the cable with the monitor, a third-party USB-C to DisplayPort connector, or Apple’s $69 Thunderbolt 4 (USB-C) Pro Cable. Once you have the suitable cable, connect one end to your device and the other to the DisplayPort connector on the monitor, and you’re good to go.
For HDMI monitors, Apple suggests using a USB-C to HDMI cable. Just plug one end into your iPhone and the other into the monitor, and you should be able to watch videos, view photos, or cast your iPhone’s display on a large screen.
The company also recommends its $69 USB-C Digital AV Multiport Adapter, which supports HDR10 or Dolby Vision on compatible monitors. Once you get the adapter, insert the Type-C end into your iPhone, plug your HDMI cable into the adapter, and its other end to the monitor.
It is important to mention that only adapters and cables that comply with HDMI 2.0 standards can output video at 4K resolution and 60Hz refresh rate.
