Singapore's telecom regulator IMDA has suspended its review of the proposed merger between mobile operators Simba and M1 while it investigates a possible breach connected to the transaction, The Straits Times reported.

The suspension halts the regulatory clock on what would be a significant consolidation move in one of Asia's most competitive mobile markets. IMDA — the Infocomm Media Development Authority — had been assessing the deal, which would reduce the number of full mobile network operators in Singapore and reshape a four-player market that has seen sustained price competition since Simba, formerly TPG Singapore, entered as the country's fourth operator.

The regulator is now probing what it described as a possible breach, an investigation that takes precedence over the merger assessment. Until the probe concludes, IMDA will not advance its substantive review of whether the combined Simba-M1 entity meets the licensing and competition criteria required for approval.

The merger, if cleared, would combine M1 — one of Singapore's incumbent operators, owned by Keppel and SP Group through Konnectivity — with Simba, the challenger brand that built its position on aggressive low-price data plans. Singapore's market also includes Singtel and StarHub, meaning the deal would leave three mobile network operators serving the city-state.

For consumers, the stakes centre on whether reduced competition reverses the price declines Simba helped drive after its 2016 spectrum win and subsequent 2019 commercial launch. For the operators, consolidation offers a path to relieve margin pressure in a saturated market with high smartphone penetration.

IMDA has not publicly detailed the nature of the possible breach under investigation, nor has it set a timeline for either completing the probe or resuming the merger review. The authority's dual role as sector regulator and competition gatekeeper for telecom mergers means the outcome of the investigation will determine whether, and when, the deal returns to formal assessment.

The suspension leaves both operators in commercial limbo. Until IMDA resolves the investigation and completes its review, the structure of Singapore's mobile market — and the fate of its fourth-operator experiment — remains formally undecided.