BT continued to increase its broadband subscriber base in the third quarter of the 2014-15 financial year, adding another 119,000 retail customers.
The service provider accounted for 46 per cent of the UK's total 258,000 DSL and fibre broadband market net additions between October and December 2014.
BT also added 209,000 retail fibre broadband customers during the quarter, as many households and businesses upgraded from DSL connections. This took the firm's super-fast subscriber base to 2.7 million.
Its next-generation fibre network is now accessible to almost 22 million premises across the UK, around three-quarters of the total.
In terms of wholesale customer additions, BT's infrastructure division achieved a record 375,000 fibre broadband net connections.
Over 3.7 million homes and businesses are now connected to the firm's super-fast wholesale network - 17 per cent of those passed.
Where pay-TV services are concerned, BT added another 45,000 subscribers.
During Q3 2014-15, the firm launched its TV Everywhere service, introduced buy-to-keep movies on multiple devices, and made Netflix available to BT TV subscribers.
These product innovations, alongside the launch of new packages, helped to keep BT TV on a growth curve.
Gavin Patterson, Chief Executive at BT, said the firm delivered "good growth" in profit before tax and strong free cash flow during Q3 2014-15.
"Openreach achieved the highest growth in the number of landlines on record. It was also our best-ever quarter for fibre broadband net additions," he explained.
"All the major communications providers are responding to the strong market demand for fibre broadband, helping to drive take-up in what is already a very competitive market."
Mr Patterson said BT, which now offers super-fast broadband deals in three-quarters of the UK, has been "at the forefront of fibre innovation and investment".
This will continue with the launch of two G.fast pilot schemes in summer 2015, which could pave the way for nationwide 500Mb broadband speeds.
He expressed the view that BT can deploy this technology at scale, which will enable it to deliver ultra-fast speeds across the UK within a decade.