I had guessed you were asking about an E5500, which cannot.  The 5500 does take M.2 format, but running an NVMe drive in the WWAN slot isn't something Dell supports --it may work, but bear in mind it will be slow going even if it does work (the slot is not wired for high speed operation, which isn't required by a WWAN card).  
[IMAGE]   Can a M.2 2242 NVMe be installed in the WWAN slot to be used as storage device on Dell Latitude 5500 ?
DELL Latitude 5500 2nd storage device