For example: Getting a Google Voice number starting with area code 252 to received inmate calls
You need to set up a “local” phone number in Google Voice for your inmate. In other words, if person is incarcerated in the area with 252 area code, you need to set up a number in Google Voice with that same area code. When this number is dialed, it is routed by Google Voice to your home phone or cell phone (in another state). The inmate only pays for the local call. He or she is dialing a local call for him/her and that is what is charged. Assuming the facility does not block Google Voice numbers, this is much, much cheaper than the ridiculous fees charged by the prisons.
You need to send the Google Voice number to your inmate and have it added to their list of approved phone numbers.
Follow the link below for the how to guide. You just do a search for that area code and select any of the available numbers within that area code.