Revenue up from high speed access
More than 160,000 homes and businesses in Northern Ireland receive high speed broadband.
The roll out in services helped BT Ireland record a 3% revenue rise, the company said, as it announced trading results up to the end of last year.
Colm O'Neill, chief executive of BT in Northern Ireland, said: "Today's results reflect a positive quarter for our Northern Ireland operation.
"The fibre broadband market is growing steadily, with over 160,000 homes and businesses now enjoying high speed broadband access, while continuing investment in our network services has resulted in a number of significant new deals for our business division."
The 3% increase in underlying revenue was worth an extra £49 million over the last three months of last year compared with the same period in 2012.
BT Group plc across the UK and Ireland said profit before tax from October to December last year was up 8%, earnings per share also up 12%, with a growth in revenue.
In November BT announced the creation of 165 new jobs for Northern Ireland with the expansion of its Belfast contact centre operation.