A trial kicked off today and is set to run for five weeks at the Competition Appeal Tribunal in London View 3 Images Millions of smartphone users could be owed compensation, it is claimed (Image: Tim Robberts via Getty Images)

Millions of Apple and Samsung smartphone owners could be in line for compensation if a landmark legal claim lodged by consumer watchdog Which? is successful. The case hinges on whether Qualcomm, a global tech firm that designs and manufactures wireless telecommunications products, software, and services, held what is known as "market power" - and, if so, whether it abused this position.

Which? has alleged that Qualcomm charged manufacturers like Apple and Samsung inflated fees for technology licences, which it argues would have been passed on to con

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