Telecoms watchdog Ofcom has opened an investigation into BT's new residential retail tariff packages for line rental and calls.
The investigation, carried out under Chapter II of the Competition Act, will examine whether the tariff packages constitute an abuse of a dominant position.
Ofcom said it has received representations from 13 stakeholders, including competing operators offering consumers a Carrier Pre-Select (CPS) service, who need to route calls over BT's network using a wholesale service provided by the telco.
These CPS operators have raised concerns that BT's retail tariff packages for line rental and calls, when combined with the wholesale price they must pay BT for call conveyance, will distort competition.
Almost three million UK households have switched from BT to CPS operators.
If the regulatory body concludes that there is a case for interim measures against BT, the options could include a requirement upon the telco to cease or reverse its proposed new tariffs.
Ofcom said it expects to reach a conclusion within the next four weeks.
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