Apple Inc. and Google’s Android were earmarked by the UK’s antitrust watchdog for a raft of new rules targeting their power in mobile ecosystems, a market almost completely dominated by the US giants.

Britain on Wednesday told Apple and Google to be fairer in how they distribute apps on their mobile platforms, setting out possible interventions as it plans to designate the U.S. tech companies with strategic market status over their duopoly.

Apple and Google may be forced to make changes over mobile platform ‘duopoly’ - Firms designated with strategic market status can have conduct requirements imposed on them.