[header] How to make free calls on android with google voice [title] Get hangouts and the hangouts dialer. [step] The hangouts dialer enables calling in the hangouts app. The hangouts dialer will also allow you to make free calls to people who are not in your gmail contact list. 
You must also have hangouts first before you can use the hangouts dialer. [substeps] Hangouts is usually preinstalled in most android devices.