You can delete a contact from your own personal directory.

1.Access your personal directory contacts:
a.Press the key contacts CONTACTS key. The directory menu is displayed.
b.Use the left arrow left and right right arrow arrow keys to select your Personal directory.
c.Use the up arrow up and down down arrow arrow keys to scroll through the list. Alternatively you can start dialing the name you want to find to display only matching entries as follows:
Pressing a key enters all of the characters represented by that key. Pressing another key adds the characters from that button to the previous key press. For example, dialing 527 matches all names starting with JAS (for example "Jason") and with KAR (for example "Karl") plus any other letter combinations from those 3 key presses. See How the Directory Search Works.
To remove all the characters entered so far press Clear.
d.To view more details of the highlighted name, press Details. To return to the directory press List.
2.Locate the required entry.
3.Press the Details soft key.
4.Press the More soft key and then the Delete soft key.
5.Press the Delete soft key again to confirm the action.

Note: If you have been configured as a system phone user by the system administrator, then you can also add, edit and delete some external directory contacts.