Call, email or visit your city's main government office. Ask one of the service representatives which company provides local phone service.
Visit the public library. Get a local phone book, and look in the front few pages of the book to find out who provides local phone service.
Ask one of your neighbors who provides local phone service.
Look in your mailbox for "a Welcome to Your New Home" packet after you move. See if the local phone provider has sent you any advertisements for phone service.