What is typical interface for WLAN chipset on a modern smartphone?
Looking at some random teardown page the Iphone X seems to use a Murata module.


Murata only has one listed 802.11ac module at their webpage, but you can be pretty sure that Apple gets their own tailor made version. At least this gives a hint on the interface used, USB or SDIO.


Another module manufacturer like u-blox uses SDIO or PCIe for their "Emmy" or "Nina" Wifi modules.