We appreciate that 2025 seems a long way into the future. But the switch-off is already happening, as this so-called ‘stop sell’ transition is due to be in place across the UK by September 2023. This means that after that date, nobody – whether consumers or businesses – will be able to buy or add new features to their PSTN or ISDN-based telephone services, so you need to start planning your move today because there could be a lot to do.