T580 Xda [better] -

Then the 4K panel split into four grainy video feeds, all black and white, all dated . A lab. A server rack. A woman in a lab coat holding a board that looked exactly like the T580’s motherboard—except where the WWAN slot should be, there was a small daughterboard with a coaxial port.

Karl’s hands went cold. He never put a SIM in the WWAN slot. But the XDA’s daughterboard didn't need a SIM—it had a direct RF tap that piggybacked on the laptop’s own antennas, listening for a wake tone buried in commercial LTE traffic. t580 xda

Tonight, the laptop woke him up.