Fuzzy caller ID

Instead of treating as a binary yes/no the question of whether the calling number matches something in Contacts, in cases where the number is not a strict match, display five (or so) numbers from contacts (or I suppose from some online directory or database) that are the "five nearest" according to some approximate string (or number) matching algorithm. Of particular interest of course, are cases where "first n digits match," as this is an attribute of your basic centrex or similar office telephony setups. Proabably use a different color scheme, formatting for inexact matches than exact matches. In the case that the first 6 digits match, the first 6 digits will be in boldface. If the first 7 digits match, that one would be ranked higher in the list.