All iPhone 15 Models Support DisplayPort for Up to 4K HDR Video Output to External Display
The new iPhone 15, iPhone 15 Plus, iPhone 15 Pro, and iPhone 15 Pro Max all support DisplayPort for up to 4K HDR video mirroring and video output to an external display or TV, according to Apple's tech specs for the devices.
DisplayPort support is built into the USB-C port on all iPhone 15 models, meaning that the devices can output video at up to 4K/60Hz natively to a DisplayPort-equipped external display or TV with a supported USB-C to DisplayPort cable. Alternatively, you can use Apple's $69 USB-C Digital AV Multiport Adapter to mirror video from any iPhone 15 to an HDMI-equipped TV or display at up to 4K/60Hz, but HDR is not supported this way.
On previous iPhones with a Lightning port, video mirroring is limited to 1080p with Apple's Lightning-to-HDMI or Lightning-to-VGA adapters.
Unfortunately for fans of the Stage Manager feature on select iPad models, the iPhone does not yet offer an extended display mode.
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