Classic phone lines that have been supplied to properties in the UK for decades are now becoming obsolete and will be replaced by VOIP which will work over fibre broadband connectivity. Most phones are now using VOIP already, but there are still 1000s of PSTN users which will lose their service if they don't switch by December 2025. We believe that the longer you leave it to switch, the more expensive new contracts will cost when the PSTN switch off approaches.