Google Voice
Almost all domestic and outbound calls to the United States ( including Alaska and Hawaii ) and Canada are free from the U . S . 
<triplet> United States <subj> Alaska <obj> contains administrative territorial entity <subj> Hawaii <obj> contains administrative territorial entity <triplet> Alaska <subj> United States <obj> located in the administrative territorial entity <triplet> Hawaii <subj> United States <obj> located in the administrative territorial entity