I found this list :
https://www.uperfectmonitor.com/pages/list-of-smartphones-with-displayport-alt-mode
Does it seems correct ? Should i cross-check with gsmarena ?

Okay ! thanks for the answers.
I have one more question then : how can i identify a phone that have this kind of capability ? I mean the USB-C display capability ?

Hello there !
I have a oneplus 5 with ubuntu touch on it and trying to plug an icy box : this one https://icybox.de/en/product.php?id=11

However, when trying to settup an external display, it looks like the icy box is not recognized and i don't have the external monitor choice.

How could i investigate the problem here ? Is there anything i am missing here ?
Regards