Details from HuffPo:
On New Year’s Eve at 11:45 am, Pope Francis called up the small community of the Carmelite nuns of Luccena in Cordoba, Spain, but they didn’t pick up the phone. Their once-large community has now dwindled to a mere five nuns, three of which are from Argentina, which is also the pope’s home country. He left them a voicemail in Spanish which said:
What are the nuns doing that they can’t answer [the phone]? I am Pope Francis, I wish to greet you in this end of the year, I will see if I can call you later. May God bless you!
According to ABC, he managed to get a hold of them at 7:15 pm and convey his good wishes for the new year.
Listen to the message here, in Spanish.