Blisk phones list is a group of devices, located in the browser devices list. Read more about browser devices list here.
If you can not find the phones list - it might has been collapsed. Find the phones toggler on the top of devices list. Clicking this button expands/collapses the list of browser phones. The indicator means, that the list is collapsed. The indicator means, that the list is expanded.
Please note, that if you collapse phones list - Blisk will save it's state. It means that if you open the new tab or a new window - the phones list will be collapsed.