<http://schema.org/description>
"Wi-Fi connectivity is already available in the London Underground, but to gain access you currently need to be a Vodafone, O2, EE (including T-Mobile and Orange) or Virgin Media customer. ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/uk/2014/07/17/three-finally-offer-subscribers-free-wi-fi-london-underground-month/>