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Most LLU operators only unbundle the broadband service leaving the traditional telephone service using BT's core equipment (with or without the provision of [[carrier preselect]]). Where the traditional telephone service is also unbundled (full LLU), operators usually prohibit the facility where selected calls can be made using the networks of other telephone providers (i.e. accessed using a three- to five-digit prefix beginning with '1'). These calls can usually still be made by using an 0800 or other non-geographic (NGN) access code.
Although regulators in the UK admitted that the market could provide competitive offerings in due time, the purpose of mandatory local loop unbundling in the United Kingdom was to speed the delivery of advanced services to consumers.<ref>{{cite journal |first1=Jerry A. |last1=Hausman |first2=J. Gregory |last2=Sidak |title=Did Mandatory Unbundling Achieve Its Purpose? Empirical Evidence from Five Countries |volume=1 |issue=1 |journal=Journal of Competition Law and Economics |pages=173–245 |date=March 2005 |url=https://academic.oup.com/jcle/article-abstract/1/1/173/848962 |doi=10.1093/joclec/nhi005 |publisher=Oxford University Press |access-date=14 August 2022|hdl=1721.1/63450 |hdl-access=free }}</ref>
===United States===
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