DUDU-Meng Hi, I have tried press and hold the "Phone" and "Phone Voice" SWC button, the effect is no different from single pressing the "Phone" and "Phone Voice" SWC button.
But I need to mention that my car's SWC doesn't seems to recognize long pressing of SWC. The only long press SWC that works for my car is "volume+" and "volume-". But for other SWC which I have tried to learn as a long press, it doesn't works on my car. I feel like my car's SWC long press is another issue that I should open or find an existing post to seek support.