Apple and Google may be required to change the way they operate some of their mobile services in the UK, according to proposed decisions by the UK's competition regulator.
The Competition and Markets Authority (CMA) is investigating the tech giants over their app stores, browsers and operating systems.
"Around 90-100% of UK mobile devices running on Apple or Google's mobile platforms," the CMA said, adding this means the firms "hold an effective duopoly".
Apple said it is concerned the ruling would negatively impact its customers in the UK, while Google called the decision "both disappointing and unwarranted".
A law which came in last year means the regulator can demand changes at a firm if it is found to hold too much market power.
