A report by the Island's communications regulator shows Manx Telecom's market dominance.
The Communications and Utilities Regulatory Authority's communications market statistics have been published on its website.
The report shows 89 per cent of landlines are Manx Telecom customers, and the company accounts for 60 per cent of mobile phones on the Island.
In the document, statistics also show three-quarters of broadband subscribers are with MT.
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