Just as it warned it would, Samsung has added Apple’s iPhone 5 to a patent lawsuit in the US, kicking the door open for phase two of the legal spat between the tech titans. Samsung filed a motion with a court in California accusing the Cupertino-based rival of infringing patents covering technologies that may include 4G connectivity. Samsung said: “We have always preferred to compete in the marketplace with our innovative products, rather than in courtrooms. However, Apple continues to take aggressive legal measures that will limit market competition. “Under these circumstances, we have little choice but to take the steps necessary to protect our innovations and intellectual property rights.” Samsung previously stated that the inclusion of 4G LTE in the iPhone 5 would prompt swift legal action, undoubtedly motivated by a desire for retaliation following a massive courtroom defeat in August that saw it ordered to pay Apple £664m in damages for “wilfully copying” iOS products. The decision would have also been boosted by the electronics maker’s substantial war chest of patents relating to 4G technologies. The exact details of the filing are still under wraps but are sure to surface in the days ahead and reveal whether Samsung has a good case, especially one that could be followed with an injunction on the sale of iPhone 5s. Apple has yet to comment on the developments, but is undoubtedly scrambling its lawyers to prepare a defence. We’ll bring you all the gen as soon as we have more to share. Stay tuned.