I would Call all my battle buddies in the Armed service all over the world. the Galaxy Nexus is the FREAKING BOMB. I would so be the Coolest SGT in my Unit with one of those.
I'd call my friends from school that are now scattered around the country - it'd be great to catch up during the holidays and give them my best wishes!
I will be calling my nephew to thank him for his service and successful return from combat in Afghanistan and keeping us safe so that we can celebrate Christmas and the holidays. Hopefully I can call him on my new Nexus.
On a serious note: I have been using Rebtel since 2 years now. I spend over $120 every month calling Dubai and Pakistan to my loved ones. Some extra credit would be great with that awesome phone!