AT&T (AT&T Mobility) (3:22-cv-00293), T-Mobile (Sprint) (3:22-cv-00295, 3:22-cv-00294), and Verizon (Verizon Wireless) (3:22-cv-00291) have responded to a set of Eastern District of Texas complaints that Telecom Network Solutions LLC (TNS) filed in November of last year by suing in separate complaints of their own, each seeking a declaratory judgment of noninfringement—but from the Northern District of Texas instead. The DJ plaintiffs argue that TNS did not take ownership of the patent that it attempted to assert in those November 2021 complaints until December 2021.