There are several choices. Fairpoint Communications owns the copper infrastructure and can provide basic voice service:
Fairpoint Communications
1.866.984.2001
Metrocast can provide digital voice services over the coax infrastructure:
Metrocast
1.866.984.2001
You can get a inexpensive bridge and use a cell phone to run your land line:
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1