Overwritten phonebook in SE K800i

Welcome.

I have problem with Sony Ericsson K800i. How can I recover edited (probably many times) phonebook entries (stored in phone memory)?

You say edited but not the conditions operating at the time or the timescales involved.

I am not aware K800i having an 'auto recovery save', 'shadow copy', 'roll back' feature for the phonebook every time a user enters a digit and then corrects a digit.

Difficult because edited numbers are not usually saved unless they have been used in a call attempt, then maybe a copy of the number might still be resident in the MIDP shared db. See if this provides any assistance - http//www.forensicfocus.com/Forums/viewtopic/t=2722/