if you can find a self contained digital handset, there is an adapter with phone jack in and set of alligator clips out that would allow you to tap into any traditional service at the drop box leading into a dwelling(jump terminals till you get a dial tone)...six foot of cord with an adapter should be enough... most of the interface boxes have a regular phone line jack in them now but might need a nut wrench or screwdriver to open the cover... thought I might have to "borrow" service somewhere...there are a couple of articles on making a "lineman's handset" on the internet