Disclosure: I work with DashScreen ( https://dashscreen.co.uk ), a UK shop for portable wireless CarPlay / Android Auto displays. This walkthrough is based on how we set up the unit on older cars and vans.

Why skip a stereo swap?

On leased cars, older vans, or radios that still work fine, replacing the head unit is expensive and sometimes not allowed. A portable touchscreen that talks wireless Apple CarPlay and Android Auto keeps the factory stereo and still gives you maps, calls, and media on a dedicated screen.

What you need

A portable display that supports wireless CarPlay and Android Auto

12V power (cigarette lighter is enough for most setups)

A phone with CarPlay or Android Auto enabled

Optional: a reverse camera lead if your unit has an input

Setup steps that usually work

Mount the screen where it does not block airbags or the driver's view.

Power it on and complete the first-run language / region screens.

On iPhone: Settings → General → CarPlay → Available Cars, then pair when the screen…