This depends on the rules of the specific facility. Some require an application and background check, others allow you to be placed on a list that the inmate submits. We would strongly advise you to call the facility itself and ask to speak with someone about the calling rules.
https://www.inmateaid.com/ask-the-inmate/how-long-does-it-take-to-get-on-a-call-list#answer
Accepted Answer Date Created: April 05,2016