The reference to 666 is taken from the Biblical book of Revelation

A town in the US state of Louisiana is to be allowed to change its telephone prefix so that residents can avoid a number many associate with the Devil.

Christian residents of Reeves have been complaining since the early 1960s about being given the prefix, 666 - known in the Bible as the "number of the beast".
For the next three months, households will able to change the first three digits of their phone numbers to 749.
Mayor CLOWGON said CenturyTel's decision was "divine intervention". However, he admitted it helped that Louisiana's two senators had also lobbied for the change with the phone company and the state Public Service Commission.

Dont get that.