Compassionate Calling and Immigrant Family Reunification Act of 2018 This bill directs the Federal Communications Commission (FCC) to promulgate regulations to ensure access to voice service by any alien guardian who is detained or incarcerated under the immigration laws separately from the alien child of such guardian, and by the alien child, to facilitate communications between, and reunification of, such guardian and child. The FCC shall ensure access to voice service: (1) at the facility at which the alien guardian is detained or incarcerated and at the facility at which the alien child is detained, (2) at no charge to the guardian or child, and (3) until the guardian is reunited with the child. The Second Report and Order of the Commission in the matter of Rates for Interstate Inmate Calling Services (adopted October 22, 2015) shall apply, beginning on the date of this bill's enactment. The report adopts comprehensive reform of all aspects of inmate calling services.