Maybe you can get your home number ported over to Google Voice pretty soon. (It seems to be available in select areas only.) The number on this website is a Google number, and it is fairly reliable. very once in a while it seems to go down for a little while – but Time Warner in this area is notoriously bad in this way so I’m not sure who to blame.
For example, digital phone service was out for a good chunk of the day on the 19th and sometimes the internet just goes dead for minutes or hours. Sometimes I’ve called and they didn’t even know the internet was out (or so they said.)