Apparently T480s can boot directly from WWAN Slot! : r/thinkpad
Solved: mSATA SSD in WWAN slot in e7240 - Dell Community
M2 SSD in WWAN slot help : r/thinkpad
SanDisk 512GB NVME disk in T480 WWAN slot - Test results : r/thinkpad
Dell Latitude 5401 - install second SSD into WWAN slot! - YouTube
T580 upgrade and WWAN Slot SSD finding : r/thinkpad
Latitude 5480, 2nd SSD in WWAN slot confirmed working : r/Dell
laptop - Thinkpad T450s WWAN M.2 slot - M or B key? - Super User
wwan slot | dayene00 | Flickr
NGFF M.2 Key B to USB 3.0 Adapter Expansion Card with SIM 8pin Card Slot for WWAN/LTE 3G/4G/5G Module Support 3042/3052 M.2 SSD|Computer Cables & Connectors| - AliExpress
Mini PCIe WWAN Card to USB Adapter with SIM Slot, Mini PCI Express WWAN/LTE/4G Module Tester Converter, Support 30mm 50mm Wireless Wide Area Network Card
M.2 B-key to SD4.0 Memory Card UHS-II USB 3.0 High Speed NGFF For WWAN Slot | eBay