Almost all calls within the US and Canada are free. International calls are near enough free.
We use our home landline phones the same way we have always used them. People continue to call our old landline phone number.We've been using Google Voice since 2009. It has most of the features of regular POTS (plain old telephone service) and a few extras for people who like to travel. It emails voice mails, filters spam, and lets us have a single number for our home and cell phones.
It takes a few days to set everything up, but if you value saving around $4,000 over the next ten years, this is the way to go. There are five steps: