Competition in unbundled broadband services has reached seven million lines, up from only 123,000 five years ago.
The surge in unbundling followed a set of legally-binding undertakings agreed between regulator Ofcom and BT in September 2005. Before these agreements most people could only access broadband services through BT.
Today more than 30 companies offer unbundled services to homes and small businesses, which has helped to improve broadband uptake and drive down fixed-line prices.
And while five years ago consumers paid an average of £23.30 a month (excluding VAT) fr broadband services, the amount is now around £13.31 for the same service, according to Ofcom research.
In September 2005, 37% of households and small businesses had broadband - the figure is now around 71%.
BT recently announced that it is investing £2.5bn to roll out fibre broadband to two-thirds of the UK.