Some colleague in the group has already managed to configure Koha for sending messages and notices via SMS.

If you tell us more about what kind of trouble you're having it might make it easier for someone to offer help. Are you using a specific SMSSendDriver? https://koha-community.org/manual/20.11/en/html/patronspreferences.html#smss... If you're using SMSSendDriver = "Email," have you configured SMS cellular providers? https://koha-community.org/manual/20.11/en/html/administration.html?highligh... -- Owen -- Web Developer Athens County Public Libraries (740) 737-6006 https://www.myacpl.org