I dumped my old U.S. Cellular plan that was costing me $80 bucks a month.
I initially tried moving my Galaxy s3 to Airvoice, but it was not so easy. After a few days my wife started getting mad that I no longer had a working phone, so I had to think quick.
I ended up getting a Tracfone @ $100 for 1 year of service with 1000 minutes. The phone cost me $10. This is ok for me since I don't call a lot of people, BUT I do like my s4.
So, I figured, why not just keep it? Anytime I'm using it for all it's awesome features, I'm usually around wifi, or don't need data. So now, I just keep it as a badass pda. If I don't need it, I just bring my super small, light, and incredibly battery efficient Tracfone.
To save money further, I setup Google Voice. I have it forward to my office phone during office hours, and my Tracfone at all times. I also downloaded an app called GV+ on my Galaxy s4. This allows me to make and accept calls to my Google Voice number for FREE! There is a slight latency when using it over wifi, but it on the scale of maybe 50-200ms.
All in all, this comes out to a savings of $80 - ($100 / 12) = $71.67 per month!
$71.67 * 177 = $12,685.59 worth of savings over 10 years!
If I would have kept my plan, it would have cost me $9,600. Taking this into account, our savings swing is more like $22,285.59.
Over time, I'm going to try to cut that $8.33 down as low as I can. Since I'll be using Google Voice, nobody will even know if I swap out the Tracfone for something else.