In my opinion, Google Voice should be enough on its own for most people to quit paying for phone service. But in some cases, you might need just a little bit more.
One current weakness of Google Voice is that it is only available inside of a web browser. I’m sure that will change at some point in the future, but for today, that’s a limitation that I can’t get past — especially since the in-browser implementation relies on Adobe Flash. That means it won’t work on an iPad or iPod.
I travel a lot, and when I travel I typically do not take a computer with me — just my iPad. So for the times when I want to be available, I can run Skype on my iPad or on an iPod Touch. And for a few dollars, I get a phone number from Skype to which Google Voice will forward calls.
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That also makes it more convenient to talk at home or at the office, because I can walk around while talking on Skype for iPhone/iPod, whereas I’d be stuck in one place if I talked on the computer.
Also, since I use Skype a lot, this is more convenient for me. Skype is always running on whatever computer I’m working on, so I don’t have to remember to open a browser and park it on the Gmail site all day just to receive calls.