It's soldered down/integrated. There is a mini pci express slot that the WWAN connects to, but it's wired electrically to the USB2 bus, not the PCIe bus, so th

It's soldered down/integrated. There is a mini pci express slot that the WWAN connects to, but it's wired electrically to the USB2 bus, not the PCIe bus, so that doesn't help. (I wouldn't be annoyed if it were possible to swap it out for larger storage somehow.)