BT is introducing a broadband booster which it says will improve any ADSL connection, even if the user is not a subscriber to BT's broadband service.
The I-Plate, which will cost £7.57, uses filtering technology to clean-up the data signal on the telephone line within a user's house.
BT said that by using this filtering, the I-Plate can help users whose broadband line is susceptible to "dropping out" by increasing the stability of their broadband connection, which influences whether or not a line can support services like IPTV.
"We estimate that around nine million UK homes have the potential to benefit from installing this simple but effective device," BT said.
BT's benchmark of 36,000 lines showed that, on average, filtered lines achieved speed increases of around 1.5Mbps, though some lines achieved speed increases of up to 4Mbps.
The I-Plate will be available from August 17. Subscribers to BT's home broadband service can order the I-Plate for free.