O2 Business VoIP: The Ultimate Guide Quick answer
O2 Business VoIP is best understood as part of Virgin Media O2 Business voice and unified communications, rather than a simple standalone VoIP app.
Virgin Media O2 Business offers cloud voice and business calling solutions including Microsoft Teams Phone, Microsoft Teams Phone Mobile, Microsoft Direct Routing, Operator Connect, SIP Trunking, Cisco Webex Calling and unified recording. These services are designed to help businesses replace or reduce traditional landlines and connect calls, collaboration, mobile and internet services under one provider.
O2 Business VoIP is likely to suit businesses that already use O2 mobile, Virgin Media connectivity, Microsoft Teams or a wider Virgin Media O2 Business telecoms setup. It may be less suitable for very small businesses that simply want a cheap, plug-and-play VoIP phone system with transparent per-user pricing.
Best for: businesses using O2 mobile, Virgin Media connectivity, Microsoft Teams, hybrid teams and organisations wanting managed voice servicesLess so for: micro-businesses wanting basic low-cost VoIP, simple self-service setup or clear public pricingMain alternatives: BT Cloud Voice, Vodafone Business VoIP, Gamma, RingCentral, 8×8, Vonage, Daisy, Spitfire and bOnline
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Contents
Contents
Benefits of O2 Business VoIP
O2 Business VoIP products explained
Downsides of O2 Business VoIP
What Does O2 Offer?
Our Verdict on O2 Business VoIP
How do we work?
Transparent, impartial, and data‑driven reviews made by a team of expert humans, never AI generated – here’s exactly how Compare Your Business Costs helps you find the best deals from trusted UK providers: click here
Authored by: Ally Cox (Business Technology & B2B Services Specialist 10+ Years’ Experience)
Reviewed by: James Ward (Telecoms Specialist, 12+ Years Experience)
Last Updated: May 2026
O2 Business VoIP at a glance
Feature
O2 / Virgin Media O2 Business voice
Best for
Businesses wanting managed voice, mobile and connectivity together
Main services
Microsoft Teams Phone, Teams Phone Mobile, Direct Routing, Operator Connect, SIP Trunking and unified recording
Strongest fit
Microsoft Teams users, mobile-first teams, hybrid working and larger SMEs
PSTN replacement
SIP Trunking and cloud voice options available
Mobile integration
Teams Phone Mobile enables Teams calls through the mobile network
Recording
Unified Recording can record O2 mobile calls, SMS, Teams, Webex, Zoom and SIP Trunking audio/video
Pricing
Quote-based / depends on solution and users
Main strength
Strong mobile, connectivity and Microsoft Teams alignment
Main drawback
Less transparent pricing than simpler VoIP providers
Key Takeaways
O2’s current business voice offering sits under Virgin Media O2 Business.
Virgin Media O2 Business voice solutions include Microsoft Teams Phone, Microsoft Direct Routing, Operator Connect, Cisco Webex Calling and SIP Trunking.
Microsoft Teams Phone Mobile lets users make and receive Teams calls from anywhere, on any device, through the mobile network.
SIP Trunking is positioned as an option for businesses that want to keep existing on-premises phone systems after the PSTN switch-off. Virgin Media O2 Business specifically references the PSTN switch-off in 2027.
Unified Recording can record O2 mobile calls and SMS, Microsoft Teams, Cisco Webex, Zoom and SIP Trunking audio/video.
O2 Business VoIP is likely to be strongest for businesses that already use O2 mobile, Microsoft Teams or Virgin Media connectivity.
Smaller businesses wanting simple VoIP pricing may prefer bOnline, RingCentral, 8×8, Vonage, Gamma, BT Cloud Voice or Vodafone Business VoIP.
In 2025, Virgin Media O2 announced plans to combine its enterprise division with Daisy Group to create a larger B2B telecoms and IT business, which may affect future business service positioning.
Benefits of O2 Business VoIP
Cost-effective alternative to traditional phone systems, reducing overall communication costs.
Wide range of advanced VoIP features, such as call forwarding, voicemail-to-email, and video conferencing.
Strong, reliable network coverage ensuring high-quality calls.
Scalable solutions for businesses of all sizes, from small startups to large enterprises.
Simple integration with other business tools and communication platforms.
Easy online management platform for managing calls, users, and settings.
Dedicated business support team with quick response times.
Is 02 Business VoIP right for your business?
O2 Business VoIP could suit you if…
You may want to compare alternatives if…
You already use O2 business mobile
You want the cheapest simple VoIP plan
You use Virgin Media Business connectivity
You need clear public per-user pricing
Your team uses Microsoft Teams
You want fast self-service signup
You need Teams Phone or Direct Routing
You want an app-first VoIP provider
You need SIP Trunking before moving fully to cloud
You need built-in call centre tools
You want mobile, connectivity and voice from one provider
You are a very small business with basic calling needs
Our verdict:
O2 Business VoIP products explained 1. Microsoft Teams Phone
Microsoft Teams Phone lets businesses use Microsoft Teams as a business phone system, bringing calling, chat, meetings and collaboration into one app. Virgin Media O2 Business says it combines mobile and internet connectivity with Microsoft Teams software and hardware choices to bring business communications together in one place.
Best for:
businesses already using Microsoft Teams
hybrid teams
office-based and remote workers
companies replacing traditional phone systems
businesses wanting calls, chat and meetings in one platform
Pros
Strong Microsoft 365 alignment
Familiar interface for Teams users
Good for hybrid and remote working
Reduces reliance on traditional phone systems
Can simplify internal communication
Cons
Licensing can be more complex than simple VoIP
May not include all advanced call centre features
Best value if your business already uses Microsoft 365
Setup may need support
2. Microsoft Teams Phone Mobile
Teams Phone Mobile is one of the strongest O2/Virgin Media O2 voice angles because it connects Microsoft Teams calling with mobile use.
Virgin Media O2 Business says Teams Phone Mobile lets users make and receive calls in Teams from anywhere, on any device, through the mobile network. In May 2025, Virgin Media O2 Business announced Teams Phone Mobile for large business customers, saying it helps users move between mobile and desktop Teams calls.
Best for:
mobile-first teams
field workers
sales teams
hybrid employees
large businesses using Teams
businesses wanting mobile and Teams calling together
Pros
Combines mobile calling and Teams
Good for staff working away from desks
Helps unify mobile and desktop communications
Strong fit for O2 mobile customers
Cons
May be aimed more at larger businesses
Pricing likely requires a quote
Less relevant if your team does not use Microsoft Teams
3. Microsoft Direct Routing
Microsoft Direct Routing turns Microsoft Teams into a full-featured phone system by connecting Teams to external calling through a voice provider. Virgin Media O2 Business describes Direct Routing as a scalable voice solution hosted in the cloud for complex business needs.
Best for:
medium and larger businesses
businesses with complex call routing
Microsoft Teams users
organisations migrating from PBX
companies needing more control than basic Teams calling
Pros
Good for complex voice requirements
Turns Teams into a business phone system
Scalable for larger teams
Useful for businesses replacing old PBX systems
Cons
More complex than standard hosted VoIP
May need specialist setup
Pricing is not usually simple or public
4. Microsoft Operator Connect
Operator Connect is another way to connect Microsoft Teams to external phone calling. Virgin Media O2 Business says Operator Connect is suitable for organisations that want to move telephony to the cloud but do not have complex routing and integration requirements.
Best for:
Teams users
businesses moving to cloud calling
companies without complex routing needs
organisations wanting a simpler Teams telephony setup
Pros
Easier than Direct Routing for some businesses
Uses Microsoft Teams as the main calling platform
Good for Microsoft 365-led organisations
Cloud-based
Cons
Still more involved than basic VoIP
Best suited to Teams-first businesses
Not ideal if you want a non-Microsoft phone system
5. SIP Trunking
SIP Trunking is useful for businesses that still use on-premises phone systems but need to move away from legacy analogue or ISDN services.
Virgin Media O2 Business says SIP Trunking lets businesses keep using on-premises phones after the PSTN switch-off and move to cloud unified communications later.
Best for:
businesses with existing PBX systems
companies not ready for full cloud telephony
organisations planning around the PSTN switch-off
larger or multi-site businesses
businesses needing a staged migration
Pros
Helps extend existing phone system investment
Supports migration away from PSTN/ISDN
Can be more flexible than old phone lines
Useful for complex or phased migrations
Cons
Not a simple plug-and-play VoIP system
Requires suitable connectivity and configuration
Businesses should compare migration costs carefully
Benefits of O2 Business VoIP Strong fit for Microsoft Teams users
O2/Virgin Media O2 Business voice is particularly relevant if your organisation already uses Microsoft Teams. Teams Phone, Teams Phone Mobile, Direct Routing and Operator Connect all focus on bringing calls into the Microsoft environment.
Good for mobile-first teams
Teams Phone Mobile is useful for businesses with staff moving between office, field work, customer sites and home working.
Works alongside O2 mobile and Virgin Media connectivity
The main advantage is bundling voice, mobile, internet and collaboration under one business telecoms provider.
Useful for PSTN switch-off planning
SIP Trunking and cloud voice options can help businesses move away from traditional phone infrastructure ahead of the PSTN switch-off.
Unified recording options
Unified Recording can record O2 mobile calls, SMS, Microsoft Teams, Cisco Webex, Zoom and SIP Trunking audio/video, which may matter for regulated or compliance-heavy organisations.
Downsides of O2 Business VoIP Pricing is not as transparent as some VoIP providers
O2/Virgin Media O2 Business voice solutions are usually quote-based, especially for Teams Phone Mobile, Direct Routing, Operator Connect and SIP Trunking.
Not always best for very small businesses
A micro-business that just wants a simple hosted VoIP phone number may find bOnline, Vonage, RingCentral, 8×8 or Google Voice easier to compare.
Microsoft Teams focus may not suit everyone
If your team does not use Microsoft 365, O2’s Teams-led voice options may be less attractive.
Setup can be more complex
Teams Phone, Direct Routing, Operator Connect and SIP Trunking can involve licensing, routing, hardware, connectivity and migration planning.
Future business structure may change
Virgin Media O2 announced in 2025 that it would combine its enterprise division with Daisy Group to form a larger business telecoms and IT entity. This may strengthen future B2B services, but businesses should confirm current support and account management arrangements before signing.
O2 Business VoIP vs other UK VoIP providers
Provider Best for
BT Cloud Voice
Established UK businesses wanting BT-backed cloud calling
Strong traditional telecoms alternative
Vodafone Business VoIP
Businesses already using Vodafone mobile/connectivity
Similar mobile + voice bundle logic
Gamma
SMEs wanting hosted VoIP and SIP expertise
Strong UK business telecoms provider
RingCentral
App-led VoIP and UCaaS
Better for feature-rich cloud phone systems
8×8
VoIP plus contact centre features
Stronger for more advanced call handling
Vonage
Flexible hosted VoIP
Often simpler for smaller businesses
Daisy Communications VoIP
Managed telecoms and IT support
Relevant given VMO2/Daisy business telecoms merger plans
bOnline
Small businesses wanting low-cost VoIP
Simpler and more transparent for micro-businesses
Our verdict:
What Do O2 Offer
How to Purc hase O2 Business VoIP Direct:
Our verdict on O2 Business VoIP O2 Business VoIP is worth comparing if your business already uses O2 mobile, Virgin Media connectivity or Microsoft Teams.
Its strongest areas are Microsoft Teams Phone, Teams Phone Mobile, Direct Routing, SIP Trunking and unified communications. It is particularly relevant for mobile-first teams, hybrid workforces, larger SMEs and organisations trying to combine calls, collaboration, mobile and connectivity.
Its biggest drawbacks are pricing transparency and complexity. This is not the simplest VoIP option for a very small business that only wants a cheap cloud phone system.
Choose O2 Business VoIP if:
you already use O2 mobile
you use Microsoft Teams
you want mobile and Teams calling together
you need SIP Trunking before fully moving to cloud
you want voice, mobile and connectivity under one provider
you need compliance recording across mobile and collaboration tools
Consider alternatives if:
you want simple per-user VoIP pricing
you are a micro-business
you do not use Microsoft Teams
you need built-in call centre tools
you want instant setup
you want the cheapest hosted VoIP provider
Overall, O2 Business VoIP is best for businesses wanting managed mobile, connectivity and Microsoft Teams voice services. For simple hosted VoIP, compare O2 against BT, Vodafone, Gamma, RingCentral, 8×8, Vonage, Daisy and bOnline before choosing.
FAQs Does O2 offer business VoIP?
Yes. O2 business voice services are now mainly positioned through Virgin Media O2 Business voice solutions, including Microsoft Teams Phone, Teams Phone Mobile, Microsoft Direct Routing, Operator Connect, SIP Trunking and unified recording.
Is O2 Business VoIP the same as Virgin Media O2 Business voice?
For business voice and unified communications, O2 is now closely tied to Virgin Media O2 Business. The provider offers voice, mobile, connectivity and collaboration services under the wider Virgin Media O2 Business brand.
What is O2 Teams Phone Mobile?
Microsoft Teams Phone Mobile from Virgin Media O2 Business lets users make and receive Teams calls from anywhere, on any device, through the mobile network.
Does O2 offer SIP Trunking?
Yes. Virgin Media O2 Business offers SIP Trunking for businesses that want to keep using on-premises phone systems while moving away from PSTN/ISDN services.
Is O2 Business VoIP good for small businesses?
It can be, especially if you already use O2 mobile or Microsoft Teams. However, very small businesses wanting simple hosted VoIP may find providers like bOnline, Vonage, RingCentral or 8×8 easier to compare.
Is O2 Business VoIP good for Microsoft Teams users?
Yes. O2/Virgin Media O2 Business is particularly relevant for Microsoft Teams users because it offers Teams Phone, Teams Phone Mobile, Direct Routing and Operator Connect.
Does O2 Business VoIP support call recording?
Virgin Media O2 Business offers Unified Recording, which can record O2 mobile calls and SMS, Microsoft Teams, Cisco Webex, Zoom and SIP Trunking audio/video.
What are the best O2 Business VoIP alternatives?
The main alternatives include BT Cloud Voice, Vodafone Business VoIP, Gamma, RingCentral, 8×8, Vonage, Daisy Communications VoIP, Spitfire, bOnline and Microsoft Teams Phone direct.
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Hi, I’m Ally Cox , a senior copywriter and blogger at CompareYourBusinessCosts.co.uk, the UK’s trusted platform for comparing business services.over a decade of experience in the B2B sector, I specialise in simplifying complex topics like leased lines, VoIP, business energy, HR and payroll solutions, accounting software, and EPOS systems .HR, copywriting, and business operations- from clocking-in systems to card machines and office technology .informed, confident decisions when choosing products and services that improve efficiency and save money.
