The UK's Competition and Markets Authority (CMA) has confirmed it is investigating Apple and Google over their dominant position in the mobile phone market.
It is "taking a closer look" at the effective duopoly the two firms have.
That includes the operating systems Android and iOS, both app stores, and Safari and Chrome web browsers.
Officials are examining whether the pair are "stifling competition across a range of digital markets".
"The CMA is concerned this could lead to reduced innovation across the sector and consumers paying higher prices for devices and apps, or for other goods and services due to higher advertising prices," the authority said.
Apple and Google have both been contacted for comment.
The announcement also specifically highlighted the question of whether either of the two tech giants has market power over other businesses - including the app developers which rely on their app stores.
That has been a hot-button issue for the mobile industry over the past year, particularly since Epic Games launched its high-profile legal action against both Apple and Google, alleging unfair business practices.
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