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.
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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.