The Wall Street Journal reported that a criminal investigation, being pursued by US federal authorities, had grown out of civil lawsuits, in one of which a jury found the company liable for using the robotic technology from T-Mobile.
Allegations in the 2014 lawsuit were levelled after T-Mobile hired Huawei to supply smartphones. The US provider had developed a robot named Tappy to carry out QA on the phones that it sold.
The T-Mobile lawsuit claimed that Huawei employees posed many detailed queries about the robot and kept asking for specifics of the proprietary technology.
Huawei countered by making a filing that said no trade secrets were stolen because the robot was not a secret, with videos of it available on YouTube and the design and specifications published in a number of patents.
The case ended in a jury trial in 2017 and T-Mobile was awarded US$4.8 million with Huawei having been found to breach its contract.
The report made no mention of any other cases which had led to the federal investigation.
iTWire has contacted Huawei for comment.