I would use it to call my Grandmother back in Honduras. Although she has Alzheimer's she still recognizes my voice every time we call. Was going for a sob story, but that's what i would use the service for.
I can tell you that this would be a great gift for me to give to my wife, she would use it to call her friend who lives in Germany and just had a baby.
I'm going to let my mother use it over Christmas to call my grandmother in Juan Aldama, Zacatecas, Mexico! Plus It'd be nice to have ICS on a Galaxy Nexus instead of on my DINC. Merry Christmas everybody!