Business VoIP phone systems in the UK cost between £8-30 per user per month in 2026, offering SMEs a compelling alternative to traditional landlines that must be replaced by January 2027.
The Public Switched Telephone Network (PSTN) switches off completely in January 2027, forcing every UK business still using copper-based phone lines to migrate to digital alternatives. Most firms save 30-60% compared to legacy systems while gaining features that previously cost thousands.
What Does VoIP Cost for Small Businesses?
Basic VoIP plans suitable for small teams cost £7-13 per user monthly and should include unlimited UK landline and mobile calls. Plans with unlimited calling typically range from £14-20 per user monthly.
For UK SMEs, budget £15-25 per user per month for a solid hosted VoIP system with strong features. This price point delivers:
- Unlimited UK calling
- Mobile apps for remote working
- Call recording and analytics
- Auto-attendant and call routing
- Video conferencing integration
- CRM connectivity
Avoid providers that charge per minute — those costs add up fast. Always opt for unlimited calling packages for predictable monthly costs.
How Much Will VoIP Hardware Cost Your Business?
Physical IP desk phones cost £60-150 per handset, but many small businesses skip hardware entirely and use softphone apps on laptops and mobiles — cutting upfront costs to virtually zero.
Headsets typically run £30-80 each for employees who need hands-free calling throughout the day.
Hardware options for 2026:
- Softphone only: £0 (use existing devices)
- Basic IP handset: £60-100 per desk
- Premium IP handset: £100-150 per desk
- Professional headset: £30-80 per user
For a 10-person team over three years, cloud VoIP costs roughly £4,500 compared to £8,900 for traditional PBX — nearly 50% savings.
What's the Real Cost of Delaying Your VoIP Migration?
BT and Openreach confirmed that customers remaining on PSTN services after April 1st 2026 face a 20% price increase, with further 40% increases coming in July and October 2026.
Businesses that haven't migrated by January 2027 will lose telephony service entirely on that date. There is no extension, no fallback, and no grace period.
Only 18% of small businesses currently have a post-PSTN solution in place, with 17% yet to work out their next steps.
Price penalty timeline:
- April 2026: 20% increase on remaining PSTN lines
- July 2026: Additional 40% increase
- October 2026: Further 40% increase
- January 2027: Complete service termination
Which VoIP Features Do UK SMEs Need Most?
Mid-tier and premium plans usually include call recording and CRM integration, essential for most growing businesses. Core features to prioritise include:
Essential features:
- Unlimited UK calling
- Mobile and desktop apps
- Call forwarding and routing
- Voicemail-to-email
- Number porting from existing lines
Business growth features:
- Call recording for compliance
- Real-time analytics and reporting
- CRM integration (Salesforce, HubSpot)
- Video conferencing
- Team messaging
Advanced features:
- Auto-attendant with custom greetings
- Call queuing and distribution
- Conference bridges
- International calling plans
- Advanced security and encryption
Assess Current Phone Usage
Audit your existing lines, features, and monthly costs to establish your baseline requirements and budget.
Choose Hosted vs On-Premise
For the vast majority of small businesses, hosted VoIP is the clear winner due to lower upfront costs and included maintenance.
Select User Count and Features
Start with basic plans and add features as needed. Most providers allow easy upgrades without contract changes.
Plan Number Porting
Almost all UK VoIP providers support number porting, with the process taking 1-10 working days.
How Does VoIP Quality Compare to Traditional Lines?
Leading VoIP providers offer 99.99-99.999% uptime guarantees. With a stable internet connection of at least 100kbps per call, VoIP call quality matches or exceeds traditional landlines.
Modern VoIP systems deliver superior audio quality through HD voice codecs, eliminating the static and interference common with aging copper infrastructure.
Quality requirements:
- Minimum 100kbps bandwidth per concurrent call
- Stable business broadband (not domestic packages)
- Quality of Service (QoS) configuration on your network
- Professional-grade routers with SIP ALG disabled
Poor call quality will cost you clients fast. Invest in business-grade internet connectivity and proper network configuration from day one.
What Hidden Costs Should You Watch For?
Potential additional costs:
- International calling: Usually charged separately
- Advanced call recording: May require compliance-grade storage
- Premium support: 24/7 support often costs extra
- Advanced integrations: CRM connectors may have licensing fees
- Number porting fees: Some providers charge £10-25 per number
A £5/user/month system with no support and 99% uptime will cost you far more in lost productivity and missed calls than a £12/user system that works flawlessly.
Budget for success:
- Add 20% to quoted prices for realistic planning
- Factor in training time for staff
- Include network upgrades if needed
- Plan for gradual feature rollout
Frequently Asked Questions
How much should a small business spend on VoIP in 2026?
Budget £15-25 per user per month for a solid hosted VoIP system that includes unlimited UK calling, mobile apps, and essential business features.
Can I keep my existing phone numbers when switching to VoIP?
Yes, almost all UK VoIP providers support number porting. You can keep existing geographic or non-geographic numbers, with the process taking 1-10 working days.
What happens if I don't switch before January 2027?
PSTN and ISDN cease to function on 31 January 2027, with all remaining connections terminated. Businesses that haven't migrated will lose telephony service entirely.
Is VoIP really more reliable than traditional phone lines?
Leading VoIP providers offer 99.99-99.999% uptime guarantees, often exceeding traditional landline reliability while providing built-in disaster recovery through cloud hosting.
VoIP represents more than just a forced upgrade from the PSTN switch-off — it's a strategic investment that reduces costs while improving business capabilities. Small businesses across the UK are cutting phone bills by 40-60%, getting features that used to cost thousands, and giving teams flexibility to work from anywhere.
The January 2027 deadline isn't negotiable, but businesses that plan early gain significant advantages in pricing, provider choice, and implementation timeline. Start your VoIP evaluation now to avoid the rush and secure better terms for your digital transition.