THREE MOBILE IS seeking to reassure its Irish customers that they are not affected by a major hack of the UK phone network.

The Telegraph is reporting that the cyber-breach has put the data of millions of customers at risk.

The report states that the attack comes after hackers successfully accessed Three’s customer upgrade database using an employee login.

But Three Ireland has said that the problem does not affect customers here.

“Three Ireland is not affected. The system impacted is used solely by Three UK,” a statement said this evening.

Three is Ireland’s second-largest mobile phone with a market share of 35% and over two million customers. Three established its position in Ireland in 2014 after it completed the purchase of O2.

Three is owned by Hong Kong-based multinational conglomerate CK Hutchison.