LONDON (AP) — Britain’s antitrust watchdog has proposed labeling Google’s and Apple’s mobile ecosystems with “strategic market status,” which would mandate changes at the Big Tech companies to improve competition.

The U.K.’s Competition and Markets Authority (CMA) announced on Wednesday a proposal that would give Apple and Google’s mobile platforms “strategic market status” — a designation that allows the regulator to create rules that could change how their app stores operate and how their mobile software works.

The U.K.’s competition watchdog said it is proposing to impose guardrails around how tech giants Apple and Alphabet’s Google run their mobile ecosystems under a new law governing business conduct for Big Tech.