Telecommunications giant BT is holding a series of special events to raise awareness of the switch from analogue phone lines to digital – as business chiefs are urged to ensure they are prepared for the change too. In December 2025, as part of what has been called the Big Switch Off, all analogue phone systems will be turned off. Instead, all calls will be delivered via the internet instead. It forms part of a major upgrade in the technology used for calls, phasing out the copper wire telephone network – the Public Switched Telephone Network (PSTN) – and replacing it with the voice-over intern…