The polite deadline nobody should ignore
If your phones run on ISDN or analogue lines, the decision has been made for you: the UK's old phone network is being switched off, stop-sell is already in force, and the only question is whether you migrate on your timetable or the industry's. The good news is genuine: what replaces the old system is better in every measurable way — cloud phone systems cost less per month than ISDN line rental, add the features your old PBX charged fortunes for (voicemail-to-email, mobile apps, call reporting), and remove the maintenance contract on a beige box in the comms cupboard that one retired engineer still understands.
The calm migration path
The upgrade is far less disruptive than businesses fear, because it's staged: the new cloud system is built and tested alongside the old one, your numbers are ported on an agreed day (they're yours — they move with you, always), and the old lines are ceased only after everything is proven. Handsets often survive — mainstream IP phones re-provision — and most teams need training on precisely three things: answer, transfer, voicemail. The full playbook, including the contract small print to check and the first-90-days plan: the phone system buyer's guide.
Frequently asked questions
Will we lose our phone number upgrading?
No — numbers port to the new system intact. It's a regulated process; the number your customers have known for twenty years comes with you.
Our PBX still works — why move before it dies?
Because the lines behind it are being withdrawn regardless, engineer availability shrinks every quarter, and early movers migrate calmly at better prices. The forced version of this project is the expensive version.
Is cloud really cheaper than what we pay now?
Almost always — ISDN rental plus maintenance plus per-minute calls routinely exceeds a modern per-user price with calls included. The savings calculator gives you the number in thirty seconds.