This strategy worked for me: https://www.pcsuggest.com/run-shell-scripts-from-udev-rules/
The contents of /etc/udev/rules.d/phone-plugin.rules
follow.
# The following is killed as the documentation explains about `RUN'
# ACTION=="add",ATTRS{idVendor}=="04e8",ATTRS{idProduct}=="6860",RUN+="/bin/su oney -c /home/oney/bin/.sync_phone.sh | at now"
# The service activated is a USER service, so the following doesn't work
# ACTION=="add",ATTRS{idVendor}=="04e8", ATTRS{idProduct}=="6860",TAG+="systemd",ENV{SYSTEMD_WANTS}="sync-phone.service"
# The following rule works just right :)