I created this tutorial for my journalism cohort.
Google Voice is a limber and free solution for small business owners, freelancers, and indpendent contractors who want to have a phone number separate from their mobile number and don't want to pay for an additional phone bill.
I have given the very basic explanation of why it might be useful, along with some of its limitations.
As I went through the process myself, I tried to catch all the screenshots, but I'm sure I forgot some. Google will undoubtedly change their look and process as well, so how this ages remains to be seen. Use it as a guideline. I am not affiliated in Google other than being utterly dependent upon it for my email like the rest of the globe.
In this tutorial, I did not exploit all of the features remotely. Google is Google: they have great tutorials, and might I suggest you avail yourself of them!
Happy free business communications!