usb device umount option in menu missing for some devices

[deloptes <deloptes@yahoo.com>]

Hi
where I can look for a resolution of following problem.

When I plug usb stick or memory card in the notebook I see the option in the
menu to mount/umount it and it works great.

When I plug the phone (select use as usb storage device in the phone) it
appears in the menu and I can mount it but consequently there is no option
to umount it. How can this be corrected?

/dev/sdb on /media/Nokia N9 type vfat
(rw,nosuid,nodev,noatime,uid=1000,gid=1000,fmask=0022,dmask=0077,codepage=437,iocharset=iso8859-15,shortname=lower,showexec,utf8,errors=remount-ro,uhelper=udisks)

I have to execute
        udisks --unmount /dev/sdb
in the shell in this case - which is not nice enough

thanks