Varia claims many Samsung phones infringe the patent, including the Acclaim, Captivate, Epic, Galaxy Nexus, Nexus S, and Transform --- while the BlackBerry Bold, Curve, Pearl and Storm are also on the list.
According to the history of the patent, it was filed in late 2005 and granted to AOL-owned startup Wildseed. Varia Mobile was spun off from AOL in 2007, along with its employees and a number of patents. Whether or not the company is a 'trolling operation', it remains unclear.
Patent trolls are those who buy up patents for unnecessarily broad items, to then sue companies that allegedly infringe them. Arguably we've seen this happen throughout 2011 between Apple and Samsung, amongst others. But ultimately all it does is stifle innovation, and prevent the creative industries from doing its job.
It's only the ordinary people that get hurt --- so Apple, Samsung, by all means --- carry on I say, with an edge of sarcasm.