<https://optimalsolutionscorp.com/blog/409/sprints-samsung-galaxy-s4-first-for-free-wi-fi-calls-abroad>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.optimalsolutionscorp.com/blog/409/Sprint's%20Samsung%20Galaxy%20S4%20first%20for%20free%20Wi-Fi%20calls%20abroad>