BT Ignite is to slash more than 2,000 jobs as part of its attempt to become profitable.
The cuts are part of a wider plan to reduce staff numbers at the group by between 5,000 and 6,000 a year for the next three years.
BT's new chief executive, Ben Verwaayen, recently signalled there would be change at Ignite, explaining that it was an area in need of improvement.
Around half of the 2,200 job cuts will be from administration units in the UK, with most coming through voluntary redundancies and natural wastage.
A BT spokesman said that the company was also planning to recruit more than 1,200 additional staff to work in Ignite's sales and marketing areas.
BT has said that it wants Ignite - which provides telecom services to some of Europe's largest companies - to break even by next year, before interest, tax and depreciation.
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