BT's broadband customer base grew by 22,000 between July and September 2017.
This took its overall number of broadband subscribers up to 9.3 million, which includes 5.285 million fibre broadband users.
The upturn helped drive growth in BT's quarterly revenue, which rose from £5,849 million in Q2 to £5,951 million in Q3.
Gavin Patterson, Chief Executive of BT, hailed the company's performance this year, saying it is making "positive progress on all our strategic priorities".
"Improving customer experience is critical to our success and we have seen continued positive progress underpinned by investments in operational improvements, increased network quality and customer-centric product development," he commented.
Mr Patterson added that BT is working closely with the UK government, Ofcom and its communications provider partners to find the right solutions to speed up the deployment of fibre and its universal broadband commitment.
The company has committed to delivering ultrafast speeds to 12 million premises by the end of 2020.
Furthermore, BT recently volunteered to deliver universal high-speed broadband to all areas of the UK, as an alternative to regulation.
Ministers have promised to implement a new broadband Universal Service Obligation (USO) that ensures everyone in Britain has a legal right to request minimum speeds of 10Mbps by 2020.
According to the government, this is the speed that will meet the typical needs of a family that wants to browse the web, stream films and carry out video conferencing at the same time.
Under BT's offer, which would be primarily delivered by Openreach, many premises would receive speeds substantially faster than 10Mbps. As a result, the proposal could render the planned USO unnecessary.