The tech giant could be compelled to allow rival application marketplaces within the United Kingdom.
The iPhone maker could be required to allow rivals to run separate app stores on iPhones across Britain, following a decision from the market watchdog.
This would be a major shift to the company's well-known "closed system" where apps can only be installed from the company's official marketplace.
But the Competition and Markets Authority has designated both the tech giants as having "dominant market position" - effectively saying they have a lot of power over smartphone ecosystems.
Regulatory Assessment
The regulator said the two companies "could be restricting progress and competition".
But the regulator clarified it did not "determine or presume wrongdoing" from the companies.
"Mobile applications contributes one and a half percent of the British economy and supports around four hundred thousand positions, which is why it's crucial these markets work well for enterprises," commented a top executive from the competition authority.
Around ninety to one hundred percent of UK mobile devices run on the two tech companies' operating systems, creating what the regulator calls an "virtual monopoly".
Based on current data, 48.5% of British smartphone users use an iPhone - which runs the iOS operating system - with the vast majority of the remaining users using Google's Android.
The Company's Reaction
The CMA's investigation examined how prominent the companies' own applications are versus competitors - as well as their browsers and operating systems.
It is unclear what changes the regulator will look to request, but earlier it published guidelines detailing potential measures it could take.
These include mandating it to be easier for people to switch between iOS and Android devices, and for both companies to rank apps "in a fair, objective and transparent manner" in their marketplaces.
Apple specifically may be compelled to permit alternative app stores on its products, and enable people to download programs straight from developer sites.
This would follow a similar ruling in the European Union, which previously took action against Apple for restrictive practices.
The technology firm warned the United Kingdom could lose access to receiving updates - as has happened in the European Union - which the organization attributes to heavy regulation.
For example, some Apple Intelligence features which have been launched in other regions are not available in the European market.
"Apple faces fierce competition in every market where we do business, and we strive continuously to create the finest offerings, solutions and customer interface," the company said in a statement.
"Britain's implementation of EU-style rules would undermine that, resulting in consumers with reduced data protection and security, slower availability to new features, and a fragmented, less seamless experience."
The Search Giant's Standpoint
Google device owners can currently use alternative marketplaces - though critics say they are not as user-friendly as the company's official Play Store.
The regulator's plan said the search company may have to "change the user experience" of installing applications straight from online sources, as well as "eliminate barriers" when using third-party platforms.
"There appears to be no the rationale for the current classification," a Google policy executive stated.
The representative said "the majority" of Android users use alternative app stores or download apps straight from a developer's website, and claimed there is a much wider selection of applications offered for Google device owners versus those on iOS products.
"Currently available are twenty-four thousand Google-compatible devices from 1,300 device makers globally, facing strong rivalry from Apple's platform in the UK," the representative added.
Google's platform is an freely available software, which means creators can utilize and develop on top of it for no cost.
The company contends this means it promotes competition.
But consumer groups said curbs on these companies' power in other countries "currently assist enterprises to develop and giving consumers more choice".
"The companies' control is now causing real harm by limiting options for users and market rivalry for businesses," stated a consumer advocate.