What Tamar Telecommunications does

Tamar Telecommunications is a UK-based virtual phone number and cloud VoIP service provider, operated through the legal entity Kalnet4u Ltd (company number 04655311) and founded in 2002. The company sells virtual landline numbers (01/02 geographic, 0333 national, 0800 freephone, 0300 charity) and hosted VoIP phone systems to sole traders, small businesses, and SMEs across England, Scotland, Wales, and Northern Ireland, claiming a customer base of over 25,000 UK businesses. It is positioned around short contracts, transparent pricing, UK-based support (98% of calls answered within 10 seconds, per company claim), and regulatory credibility (Ofcom-regulated, ISO 27001 certified).

The product stack is built on cloud-based VoIP and virtual number infrastructure that routes inbound calls to mobile, landline, or VoIP devices over IP, eliminating the need for physical lines. Customers self-provision numbers through the Tamar Control Panel (web) and a native iOS/Android app, with a default feature bundle of 10+ free capabilities (call statistics, timed diverts, hunt groups, voicemail-to-email, holiday settings, blacklist, missed call alerts, welcome greetings, number porting). Premium add-ons include a Virtual Switchboard (IVR with up to 10 menu options), Call Whisper (caller announcement), Professional Voiceovers, and a generative-AI voiceover feature branded Tamar Voice AI. The underlying platform is operated by Tamar on its own UK telecom network across 650+ UK area codes, with WhatsApp Business compatibility on its virtual numbers.

The revenue model is predominantly recurring subscription. Virtual numbers start from £5/month per number, VoIP systems from £8/month per user, and premium features are billed as monthly add-ons (£3.76/month for Call Whisper, £6.24/month for Virtual Switchboard). One-time fees apply for premium/memorable numbers (Silver/Gold/Platinum tiers) and standard porting (£25 + VAT, often waived for Skype migrants). Distribution is direct-to-customer via self-serve website and inside sales (0800 772 0000) targeting SMBs, supplemented by a partner/reseller portal for franchise operators. Customer acquisition leans on SEO (location-targeted area code pages across 650+ UK area codes), review platforms (Trustpilot 4.8/5, Google 4.7/5, Facebook 9.4/10), email marketing via MailChimp, and content/blog marketing rather than heavy paid acquisition.

Name

Tamar Telecommunications

Legal name

Kalnet4u Ltd

Website

https://tamartelecommunications.co.uk

Company type

Private

Founded year

2002

Operating status

Operating

Headcount range

11–50 employees

Short description

Tamar Telecommunications is a UK-based virtual phone number and cloud VoIP provider, serving over 25,000 UK sole traders, small businesses, and SMEs with virtual landlines, 0800/0333/0300 numbers, and hosted VoIP systems on 1-month rolling contracts.

Ownership category

akta.pro rank

Product category

Business Telecommunications Services (Virtual Phone Numbers & Cloud VoIP)

NAICS

Wired and Wireless Telecommunications (except Satellite) (5171), Wired and Wireless Telecommunications Carriers (except Satellite) (51711), Telecommunications (517)

SIC

Telephone Communications (No Radiotelephone) (4813), Services-Telephone Interconnect Systems (7385)

akta.pro primary industry

VoIP Access & ITSP Services (HDAIAHAD)

akta.pro secondary industry

Numbering, DID, Porting & Carrier-of-Record Services (HDAIAHAK)

Keywords

• Virtual phone numbers
• Cloud VoIP services
• Business phone systems
• Mobile landline services
• Freephone number services

Headquarters

HQ city

Lynmouth

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Technology or R&D, Infrastructure, Personnel, Marketing or Sales, Operations, Supply Chain

Revenue model

1. Virtual Number Subscriptions: Monthly subscription fees charged per telephone number. Customers pay a recurring monthly fee (starting from £5/month for virtual numbers) for the number, included features, and call minutes depending on the tariff selected. The subscription includes access to free features and optional premium add-ons.
2. VoIP Phone System Subscriptions: Monthly per-user subscriptions for hosted VoIP phone systems. Plans start from £8/month and include cloud-based phone system capabilities with multiple users, extensions, and advanced call management features. Additional premium features such as Call Whisper and Virtual Switchboard are available as paid add-ons.
3. Premium Feature Add-ons: Optional paid features available as monthly add-ons to base subscriptions, including Call Whisper (£3.76/month + VAT), Virtual Switchboard (£6.24/month + VAT), Tamar Voice AI, and Professional Voiceovers.
4. Number Porting (Limited-Time Free): Standard porting fee of £25 + VAT for transferring existing numbers to the network. Currently offering free porting for Skype customers as a promotional offer. Number porting is described as a one-time service.
5. Memorable Number Purchases: Premium or memorable telephone numbers (Silver, Gold, Platinum tiers) available for one-time purchase at elevated prices, in addition to standard monthly rental fees.

Pricing tiers

Go-to-market motion2 records

Distribution channels5 records

Marketing channels7 records

Core offering

Tamar Telecommunications is a UK-based provider of virtual telephone numbers and cloud-hosted VoIP phone systems aimed at sole traders, small businesses, and SMEs. Its core offering is the "Mobile Landlines" / Virtual Numbers service: subscribers obtain geographic (01/02), national (0333), freephone (0800), or charity-only (0300) telephone numbers that route incoming calls to existing mobile or landline devices without requiring a physical line, with optional upgrade to the multi-user Tamar VoIP cloud phone system. The company sells these services on 1-month rolling contracts from £5/month for virtual numbers and £8/month per user for VoIP, including an in-house Control Panel, mobile app, and over 10 free call-management features.

Product overview

Tamar Telecommunications operates as a UK telecom service provider offering a layered product portfolio centred on virtual telephone numbers and cloud-based VoIP phone systems. The core offering consists of Virtual Numbers (Mobile Landlines) — virtual phone numbers that route calls to existing mobiles or landlines without requiring physical line installation — which spans geographic 01/02 numbers, national 0333 numbers, freephone 0800 numbers, and charity 0300 numbers. As businesses grow, they can upgrade to Tamar VoIP, a fully hosted cloud phone system providing multi-user extensions, call transfer, and dedicated mobile apps. The product family includes complementary services: Tamar Voice AI (AI-powered instant voiceovers), Virtual Switchboard (IVR menus), Call Whisper (caller identification), Professional Voiceovers (custom recordings), WhatsApp Business Integration, Fax To Email, and Call Tracking Numbers. All services share the Tamar Control Panel/Mobile App platform for unified management. Pricing starts from £5/month for virtual numbers and £8/month for VoIP systems, with over 10 standard features provided free across all plans. The company targets sole traders, small businesses, and SMEs with flexible 1-month rolling contracts and no setup fees.

Differentiator

Problem solved

Functional benefit

Brands

• Tamar VoIP: Cloud-based VoIP phone systems for businesses
• Tamar Voice AI
• Tamar Connect
• Mobile Landlines
• Virtual Switchboard

Products and services

• Mobile Landlines / Virtual Numbers Virtual UK telephone numbers (geographic 01/02, national 0333, freephone 0800, and charity-only 0300 ranges) that route incoming calls to an existing mobile, landline or VoIP handset without requiring a physical line; includes branded voicemail, welcome announcements, hunt groups, timed diverts, holiday settings, missed-call alerts, blacklist and call statistics on a 1-month rolling contract.
• Tamar VoIP Cloud Phone System Hosted, cloud-based VoIP phone system for UK small businesses providing multi-user extensions, call transfer, hunt groups, time-of-day routing, voicemail-to-email, dedicated VoIP handsets and a softphone iOS/Android app; fully configured by Tamar and available from £8 per user per month.
• Tamar Voice AI Generative-AI voiceover service that creates professional audio for welcome announcements, branded voicemail greetings, and holiday-mode messages on Tamar virtual numbers, including free one-month access for migrating Skype customers.
• VoIP Handsets (Hardware) Physical desk phones and VoIP handsets sold as accessories for customers upgrading from virtual numbers to the Tamar VoIP hosted phone system, configured and supported by Tamar.
• Number Porting Service One-time service transferring an existing UK geographic, 0333 or 0800 telephone number from another provider onto the Tamar network, handled by Tamar's customer service team; standard fee £25 + VAT, currently free for Skype customers.
• Virtual Office Numbers Virtual local telephone numbers providing a UK town or city business presence (covering 650+ UK area codes) without physical office space, with calls routed to the customer's chosen device and managed via the Tamar Control Panel.
• Remote Call Routing Numbers Geographic UK telephone numbers for specific towns or cities that route calls to any destination, used by businesses wanting a multi-area local presence without physical premises in each location.
• Call Tracking Numbers Dedicated telephone numbers assigned to specific marketing campaigns or advertising channels, paired with the Call Statistics feature, so businesses can attribute inbound calls to individual campaigns.
• Professional Voiceovers Custom professionally recorded voice greetings and announcements for Tamar business telephone numbers, offered as an alternative to AI-generated Tamar Voice AI content.

Quantifiable outcome

• 98% of calls answered within 10 seconds
• +2 more outcomes

Named customers11 records

Segments6 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration4 records

AI capability2 records

Feature19 records

Scale indicators10 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Gamma Communications: Major UK provider of cloud communications and SIP trunking serving SMEs and mid-market with hosted VoIP, Teams integration, and number porting. Comparable to Tamar in core hosted-VoIP/cloud-telephony offering and number-porting capability, though materially larger and more mid-market focused.
• Vonage (Ericsson): Global cloud communications platform providing virtual numbers, VoIP, UCaaS and AI-driven communications APIs with UK number inventory. Direct comparable on virtual-number rentals and hosted VoIP/UCaaS feature parity, competing for the same UK SMB buyers.
• Daisy Communications: UK business telecoms reseller and managed services provider offering VoIP, broadband, and mobile bundles to SMB and mid-market customers. Comparable on hosted VoIP, number provisioning, and the bundled-UK-telecom-operator positioning relative to Tamar's SMB focus.
• RingCentral: Global UCaaS/VoIP platform offering cloud phone systems, virtual numbers, IVR, call analytics and AI features to businesses of all sizes. Comparable to Tamar in core VoIP/UCaaS capabilities, though focused further upmarket into mid-market and enterprise.
• 8x8: Cloud provider of voice, video, contact-centre, and chat solutions for SMB and enterprise, with international number inventory and cloud telephony features. Direct comparable on the cloud-VoIP/UCaaS platform model and AI-driven voice features Tamar is rolling out.
• VoIPfone: UK-based VoIP and virtual number provider targeting SMEs and sole traders with cloud-hosted phone systems, geographic/non-geographic numbers, and call management features. Closely comparable to Tamar in product scope (numbers, VoIP, IVR, mobile app), target customer (UK micro/SMB), and contract flexibility (rolling monthly).

Emerging players

• Cloud telephony / hosted PBX providers (e.g., NFON, Wildix, Zoom Phone): Adjacent and emerging UCaaS and cloud-PBX vendors (Zoom Phone, NFON, Wildix) increasingly targeting European SMBs with cloud telephony and AI-enhanced voice features. Comparable to Tamar in target customer segment and hosted-VoIP/UCaaS capability, representing a growth-stage competitive threat.

Broad incumbents

• Virgin Media Business (O2 Business): Large UK carrier providing broadband, voice, and unified communications to SMB and enterprise customers through bundled offerings. Comparable as a UK voice/connectivity provider but differentiated by its incumbent connectivity bundle position versus Tamar's pure-play cloud-telephony model.
• TalkTalk Business: UK carrier offering wholesale and SMB voice, broadband, and SIP/hosted telephony products, including number ranges targeted at small businesses. Comparable to Tamar in offering hosted voice and number services to UK SMBs, but positioned as a low-cost mass-market carrier.
• BT Business: UK incumbent carrier offering PSTN/ISDN, broadband, mobile, and increasingly hosted VoIP/Teams Voice to businesses of all sizes. Overlaps with Tamar on UK voice services and PSTN migration, but competes primarily through bundled connectivity rather than stand-alone virtual numbers.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/TamarTelecom/reviews
• Xx.com/TamarTelecom

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Tamar Telecommunications