Mayfair Wireless [NPE] filed suit against AT&T, Sprint Nextel, T-Mobile, and Verizon over a patent related to mobile routers and hotspots.  Mayfair filed one prior suit against Arris, Cisco, CradlePoint, and Sierra Wireless in December 2010.  The patent-in-suit was assigned to Mayfair by Commonwealth Research Group [NPE] in December 2010.  9/1, District of Delaware, 1:2011cv00772.