An anonymous reader writes to tell us that following in the wake of their patent suit against Research in Motion (RIM), NTP has filed suit against Verizon, AT&T, Sprint Nextel, and T-Mobile for infringing on several patents. All of the patents in question relate to the delivery of email on mobile devices. "Five of the eight patents being used in the telco cases were the subject of NTP's 2001 patent suit against Research in Motion, the maker of the BlackBerry. In November 2002, a jury found that RIM infringed upon NTP's patents. The case continued to make headlines until 2006, when RIM agreed to pay NTP a settlement of $612.5 million, nearly four years after RIM had first been found guilty of infringing on NTP's patents."