# cat /etc/udev/rules.d/99-modem.rules
ACTION=="add", SUBSYSTEM=="tty", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="1001", ENV{ID_USB_INTERFACE_NUM}=="00", SYMLINK+="ttyMODEM", GROUP="dialout", MODE="0660", PROGRAM="/usr/sbin/service gammu-smsd start"
ACTION=="remove", SUBSYSTEM=="tty", ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="1001", ENV{ID_USB_INTERFACE_NUM}=="00", PROGRAM="/usr/sbin/service gammu-smsd stop"