When searching the directory, the matching names are shown as follows:
Pressing a key matches all the characters represented by that key: For example, see How the Directory Search Works
Dialing 5 matches all names starting with J, K and L. Note that the matching is applied to each part of the name.
Pressing another key adds the characters from that key. For example: now dialing 2 simultaneously matches all names starting with JA and with KA plus various others.
Pressing another key adds the characters from that key. For example: now dialing 7 simultaneously matches all names starting with JAS (for example "Jason") and with KAR (for example "Karl") plus others.
To remove all the characters entered so far, press Clear.