the HTC Vive Focus is a standalone virtual reality (VR) headset and is not designed to be directly used with mobile phones. It operates on its own, with its own hardware and software capabilities.
However, in the information you provided, HTC demonstrated a series of innovative interactive functions between new smartphones and VR devices at the Mobile World Congress (MWCS) conference. This suggests that HTC might be exploring ways to integrate their VR devices like the Vive Focus with their smartphones.
If HTC has launched the Vive Focus system update version 2.0 as mentioned and showcased interactions between new smartphones and VR devices at the MWCS conference, there is a possibility that the Vive Focus may now have some level of integration or compatibility with spec ific HTC smartphones, such as the U12+...