Since I didn't see this in any of the comments at the time I wrote this...

While GMail/Google Voice calls are free, they are much more susceptible to noise, echo, etc due to the main codec (G.711) that they use. If you have a newer smartphone with a good 4G or WiFi connection you may be able to get by with this, but in my personal experience I had to move to Skype (and be willing to pay a few dollars a month) to get people to want to talk with me for any extended period of time.

With your homies, probably not a big deal. For a sales call or interview, or when you and your SO are trying to arrange to meet at a hospital due to an emergency, yeah you want the clearer call.