iPhone External Monitor Setup: Which Cable You Need, by Model

By connector

USB-C iPhones (15, 16, 17 and later)

These carry a proper DisplayPort signal over USB-C, so you have three good options:

• USB-C to HDMI cable, the cheapest thing that works. No power, no extra ports.
• USB-C to USB-C, if your monitor takes USB-C directly. Many such monitors also supply power back down the same cable, which is ideal.
• USB-C multiport adapter, HDMI plus USB plus pass-through charging. This is the one to buy if you'll do this regularly, and the only sensible option if you also want to plug in an external drive.

Lightning iPhones

The Lightning Digital AV Adapter is the standard route: it gives HDMI plus a Lightning port for charging, which matters because driving a display drains a battery quickly. For older meeting rooms and school halls that only have VGA, the Lightning to VGA Adapter covers it.

Third-party Lightning-to-HDMI adapters vary a lot in quality; unbranded ones are the usual cause of a flickering or intermittent picture.

AirPlay, any model

Control Centre → Screen Mirroring → pick your Apple TV or smart TV. No cable, slightly more latency, dependent on your network. Fine for video and slideshows; a cable feels better for anything interactive.

The part the cable doesn't solve

Buy any of the above, plug it in, and iOS mirrors your phone: a 19.5:9 image on a 16:9 monitor, with black bars filling the difference, and everything scaled for a hand rather than a desk. That's not a cable problem, it's that iOS has no desktop mode and is copying the phone's screen rather than drawing for the monitor.

XeOS: External Display Browser is what closes that gap. It renders its own desktop at the monitor's own resolution, so the panel is fully used.

Getting the picture right

1. Connect and open the app; it detects the display.
2. In Settings › Display, choose the resolution your monitor reports, 1920 × 1080 for most, higher if the panel supports it.
3. Set content scale: around 100% at desk distance, 130–150% for a TV across a room.
4. If a border remains, it's the display's own overscan, set its picture size to "Just Scan", "Screen Fit" or "1:1".

What you can do once it's working

• Full-screen YouTube with ads blocked
• Present a PDF to a projector
• Run a photo slideshow on a TV
• Work in Google Docs and Sheets at full desktop scale
• Browse iCloud Drive and external drives

Buying advice, briefly

• Get pass-through power unless you'll only ever use this for ten minutes at a time.
• Carry a short HDMI cable. The room has the port; the cable is always plugged into something else.
• Avoid the very cheapest adapters. Flicker, dropouts and "no signal" are almost always the adapter.
• A cheap Bluetooth mouse changes the experience more than any cable will.