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

By connector

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

These carry a DisplayPort signal over USB-C, so you have three good options. A USB-C to HDMI cable is the cheapest thing that works, though it carries no power and adds no extra ports. USB-C to USB-C suits a monitor that takes USB-C directly, and many such monitors send power back down the same cable, which is the ideal arrangement. A USB-C multiport adapter gives you HDMI plus USB plus pass-through charging, and it's the one to buy if you'll do this regularly or want to plug in an external drive.

Lightning iPhones

The Lightning Digital AV Adapter is the standard route. It gives you HDMI plus a Lightning port for charging, and that second part 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 enormously 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, and it depends 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, black bars filling the difference, everything scaled for a hand rather than a desk. That isn't a cable problem. iOS has no desktop mode, so it copies the phone's screen rather than drawing for the monitor.

XeOS: External Display Browser closes that gap. It renders its own desktop at the monitor's own resolution, so the panel gets 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, that'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, because the room has the port and the cable is always plugged into something else. Avoid the very cheapest adapters, since flicker, dropouts and "no signal" are almost always the adapter rather than the phone. And buy a cheap Bluetooth mouse, which changes the experience more than any cable will.