If you have high speed Internet(cable or DSL) why don't you switch to the digital VOIP Internet phone service. The voice quality and the monthly price are great. I tried it with Primus and I'm very happy to pay less for more telephone features (caller ID, voice mail, 5 way calling, call waiting etc....). The plan’s prices starts at $15.95. Furthermore if you refer to my name and phone no. while signing up online you can get 15$ as a welcome credit. My email address is: firstname.lastname@example.org.
For more information about Primus voip phone service you can visit their website at: http://talkbroadband.ca/