It is now very easy to edit the contacts (AddressBook)
in your cell phone SIM !

With the SIManager (1.9) App by Giovanni Chiappini.

Just add the source http://repo.beyouriphone.com/ to Cydia, and install SIManager !!!

NOTE:
You will see a zillion references to a BAD repo called "http://test.beyouriphone.com/" !!