The tech giant may be forced to permit rival application marketplaces within the United Kingdom.
Apple may have to permit competitors to run their own app stores on Apple devices across Britain, after a decision from the competition regulator.
This would be a major shift to the company's well-known "closed system" where applications can only be installed from its own official marketplace.
But the UK competition watchdog has designated both the tech giants as having "dominant market position" - effectively saying they have a lot of power over smartphone ecosystems.
Regulatory Findings
The regulator said the two companies "could be restricting progress and competition".
But the authority clarified it did not "find or assume wrongdoing" from the firms.
"The app economy contributes 1.5% of the British economy and sustains around four hundred thousand positions, which is why it's crucial these markets work well for enterprises," stated a senior official from the CMA.
Approximately 90-100% of British smartphones run on the two tech companies' operating systems, creating what the regulator calls an "virtual monopoly".
Based on current data, nearly half of UK mobile owners own an Apple device - which runs the iOS operating system - with the vast majority of the rest using Google's Android.
The Company's Reaction
The CMA's investigation examined how prominent Apple and Google's own apps are compared with competitors - as well as their web applications and platform software.
It is unknown what modifications the regulator will seek to implement, but previously it published roadmaps outlining possible actions it could take.
These comprise mandating it to be more straightforward 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 app stores.
The Cupertino company particularly may be required to allow alternative app stores on its products, and enable people to install apps directly from companies' websites.
This would follow comparable regulations in the European Union, which previously took action against Apple for anti-competitive behaviour.
The technology firm cautioned the United Kingdom could lose access to getting new features - as has occurred in the European Union - which the organization attributes to strict rules.
For example, some Apple Intelligence capabilities which have been launched in other parts of the world are not available in the European market.
"Apple encounters intense rivalry in every market where we operate, and we strive continuously to create the best products, solutions and customer interface," the company said in a statement.
"The UK's adoption of European regulations would undermine that, resulting in consumers with weaker privacy and security, delayed access to new features, and a fragmented, more complicated experience."
The Search Giant's Position
Android users can presently use alternative marketplaces - though commentators say they are not as smooth as Google's own Play Store.
The regulator's plan said Google may have to "modify the interface" of downloading apps 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 company policy executive remarked.
The executive said "the majority" of Android users use third-party platforms or install applications straight from a developer's website, and claimed there is a much wider selection of apps offered for Android users compared to those on Apple devices.
"There are now twenty-four thousand Google-compatible devices from thirteen hundred device makers globally, facing intense competition from iOS in the UK," the spokesperson added.
Google's platform is an open-source operating system, which means developers can utilize and develop on top of it for no cost.
Google contends this means it promotes competition.
But consumer groups said restrictions on these companies' power in other countries "currently assist businesses to develop and giving consumers more choice".
"The companies' control is now creating genuine problems by restricting choice for users and market rivalry for companies," commented a policy expert.