Opal offers voice telephony services primarily to the corporate and SME markets in the UK. The company was established in 1995 and employs over 250 people. Opal owns a national telecommunications network interconnected with BT and a number of other network operators. This network, comprising five interconnected digital exchanges, has over 100 points of interconnect in the UK.

Opal's strategy is to lease transmission capacity and focus capital investment on the development of bespoke intelligent network solutions. The business has developed its own intelligent network (IN) and interactive voice response (IVR) platforms. In November 2002 Opal became part of The Carphone Warehouse plc group of companies.