PSTN Switch-Off 2027: Risks for SMEs

The BT PSTN switch-off is one of the most significant changes UK businesses will face in the next two years. By January 2027, the Public Switched Telephone Network (PSTN) will be fully retired.

For SMEs, this change brings both risks and opportunities.

Risks of Delaying Action

If your business still relies on PSTN or ISDN lines, you face:

• Disrupted phone systems when the network is switched off.

• Alarm systems and payment terminals that may stop functioning.

• Higher costs and delays if you leave migration until late 2026.

Opportunities for Early Movers

Shifting to cloud telephony (VoIP) ahead of the rush can deliver:

• Cost savings compared to legacy contracts.

• Flexible systems that support remote and hybrid working.

• Improved reliability and security.

Next Steps for SMEs

1. Audit which of your systems still rely on PSTN lines.

2. Explore cloud telephony and connectivity providers.

3. Avoid the 2026 bottleneck by migrating early.

At Supplier Synergy, we help SMEs cut through the noise, shortlist trusted providers, and plan migrations smoothly.

👉 Learn more: https://suppliersynergy.co.uk/business-connectivity-communications
👉 Contact us: https://suppliersynergy.co.uk/contact