The country’s Competition and Markets Authority is investigating mobile ecosystems controlled by Apple and Alphabet’s Google to work out if they need to obey a strict new law governing digital competition.

Google’s Android and Apple’s iOS are facing fresh scrutiny from Britain’s competition watchdog, which unveiled investigations targeting the two tech giants’ mobile phone ecosystems under new powers to crack down on digital market abuses.

Apple Inc. and Alphabet Inc. were hit with UK antitrust investigations over concerns their dominance in mobile services is distorting the market and putting up barriers to entry for competitors.