_           _                 
 | |_ ___  __| |____  ___ _   _ 
 | __/ _ \/ _` |_  / / _ \ | | |
 | ||  __/ (_| |/ / |  __/ |_| |
  \__\___|\__,_/___(_)___|\__,_|

Mount a USB-connected Android phone for file transfer in Debian Linux

To mount the phone's filesystem:

sudo apt install jmtpfs
mkdir phone
jmtpfs phone

To unmount the file system:

umount phone