The Best Business Phone Line Providers 2021

Discover the best provider for your phone system and internet service with our business phone line comparison

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Whether you’re working from home or the office, you’ll need to make sure your business has a phone line installed and set up. A business phone line isn’t just necessary for your telephone system – it’s also necessary for your internet connection. 

If you don’t have a business phone line already installed, your new provider will be able to put one in for a small upfront cost – usually around £50 to £150. You can then choose whether you want a calls-only contract or whether you want to add broadband, too. 

That means that the on-going cost for your business phone line will depend on what you want from your phone and – if you choose an internet package – broadband service contract. For example, your inclusive call minutes, internet speed, and download limit. 

The phone service providers that we have chosen in our comparison offer businesses both telephone and internet services, which means you can choose to have everything you need in one package. Using one provider for both usually works out more cost-effective.

If you’d like to invest in an internet-based phone system for your business, you’ll still need a phone line. While some providers offer digital or virtual landline numbers, specialist VoIP providers offer more sophisticated call management software packages.

We’ve provided you with the essential comparison points in the table below, but you should always make sure that you carry out thorough research before signing on the dotted line. 

Why not use our tool to help you find the best provider for your business? It’ll ask you a couple of simple questions, then match you with the best provider for your needs. Easy!

Business phone line comparison

The best business phone line providers are 4Com, BT, Virgin, XLN, TalkTalk, Lily Comms, and KCOM.

Compare them in the table below:

Phone line providerFibre broadband option?Digital phone line/VoIP option?SIP Trunk option?Phone only prices fromPhone and broadband packages from
4ComYes Yes Yes On request On request
BTYes Yes Yes £20.90/month£52.45/month
XLNYes Yes No£18.95/month£18.95/month
TalkTalkYes NoYes £16.95/month£23.95/month
Lily CommsYes Yes Yes On request On request
KCOMYes Yes Yes On request On request

Our Top Business telephone providers: what do you need to know?

Let’s take a look at our pick of the best business phone providers in more detail.

1. 4Com

Offering wholesale call prices and using Tier 1 call carriers, 4Com is a great for any business looking for reasonably priced reliable phone and broadband. In addition to its phone and broadband, 4Com offers sophisticated VoIP software and a selection of touchscreen phones, desk phones, and portable DECT phones. So if you’re looking for a business phone line provider to take care of everything, 4Com is certainly worth considering.

Top features and benefits: 

Single lines and multi-lines available

Uses Tier 1 carriers for top quality calls

Wholesale call rates

Employee training and UK support

Add business mobiles to your monthly package

2. BT

As the UK’s biggest telephone provider, you know exactly what you’re getting with BT. Offering a range of contracts with various lengths and prices, you should be able to find the right option for your business. And, because BT operates its own phone line infrastructure, you don’t have to wait too long to have any faults fixed. If you’re looking for more call control without investing in full on VoIP software, BT offers some lines with call management features.

Top features and benefits:

Unlimited UK and international call packages

Add additional call features, including call-barring and 3-way calling

24/7 help and support

Have faults fixed within 24 hours with Total Care package

Option to install a PBX system

3. XLN

Claiming to be 92% cheaper than BT and with a solid 4.4 star TrustPilot rating, XLN is a great option for businesses looking for a reasonably priced, reliable phone service provider. In fact, XLN’s products are designed with small businesses in mind, and include internet speeds of up to 76Mb (the recommended minimum for small businesses) and pay as you go VoIP packages. Retail businesses may also want to take note of XLN Payments!

Top features and benefits:

Keep the same number

Option included broadband, fibre, and VoIP

Reliable phone connection

Award-winning customer service

30 day contracts available

4. TalkTalk

TalkTalk is known for its reliable, fairly priced domestic phone service and it extends the same service to its business customers. TalkTalk has lots of ISDN phone line packages available, with up to 6,000 inclusive minutes on offer for its packages for medium businesses. With the option to add additional lines and features as your business grows, TalkTalk is ideal for ambitious businesses.

Top features and benefits:

Standard lines and ISDN packages available

Option to add additional lines and features

Plenty of inclusive minutes

Fixed monthly costs

UK-based customer service

5. Lily Comms

Like XLN, Lily Comms offers more than just phone and broadband, meaning businesses can purchase all of their essentials through one supplier. When it comes to business phone lines, Lily Comms offers plenty of options, including traditional phone systems, VoIP phone systems, and SIP trunking to turn your traditional line into a digital line. With a TrustPilot rating of 4.8 and heaps of five star customer service reviews across the web, it’s to no surprise that Lily Comms appears in our list.

Top features and benefits:

Competitive phone and broadband packages

Great customer service

Range of business phone numbers available

Can include business energy and merchant services

Offers services for multi-site businesses


In addition to offering a range of telecommunication services, KCOM provides specialist solutions for a wide variety of sectors, including healthcare, retail, and charity. It promises fast download and upload speeds, and with a 4.5 TrustPilot rating, great customer service, too. Anyone looking for a phone line for a VoIP phone system will be pleased to know that KCOM partners with a huge range of software providers.

Top features and benefits:

Sector-specific solutions

Phone, internet, and VoIP services available

Great customer service

Range of business numbers available

All-inclusive packages available

Business phone service provider round-up

According to our research the best small business phone service providers are:

  1. 4Com
  2. BT
  3. XLN
  4. TalkTalk
  5. Lily Comms
  6. KCOM

All of the providers on our list offer businesses the option to choose between a phone-only contract or phone and broadband. For a reliable service at a great price, 4Com and XLN are great contenders, while for broadband and phone packages TalkTalk usually comes up trumps.

While more expensive, BT offers businesses advanced features on their phone lines without the need to upgrade to a potentially pricey VoIP software package. If you’re looking for more from your phone line provider, 4Com, Lily Comms, and KCom offer a variety of VoIP and SIP trunk options.

Complete our quick quiz!

If you want to be sure that you’re investing in the right phone line for your business…

  1. Answer a few questions so we know the kind of phone service you’re looking for
  2. Receive a list of providers that suit your needs
  3. Compare zero obligation quotes

What to consider when comparing phone line providers

Firstly, think about the inclusive minutes that you need. Phone line providers offer different amounts for different monthly costs, so it’s important to conduct a business phone line comparison before you commit to a contract.

If you're looking to include internet, check available internet speeds, too. According to, a small business will need at least a 75Mb internet connection if it's looking to do things like stream videos, file share and even take numerous point of sale transactions. Luckily, 90% of the UK has access to super-fast broadband.

Secondly, you’ll need to decide on whether you’re sticking with a traditional phone service or investing in a VoIP phone service. Similarly to mobile phone contracts, business phone line providers offer inclusive minutes and the option to add-on things like calls abroad.

If you decide that VoIP is the best option for your business, make sure your business phone line speed supports web conferencing and server hosting. For small businesses with 30+ employees, take a look at packages that offer download speeds of 145Mb to 300Mb.

Bear in mind that BT is going to start switching off the traditional telephone network in 2025, so VoIP is the best way to future-proof your business. There are also a whole host of benefits to choosing VoIP which you can read about on our What is VoIP page.

Considering phone line provider service levels

And finally, what about service levels? Terry Martin, CEO of Hertfordshire-based Telecoms Company Just2Connect says:

“An important, but often overlooked factor to consider when selecting a provider for your phone line is what Service Maintenance Level is included in your line package. The Service Maintenance Level dictates how quickly a line fault can be fixed – there are 4 levels.

Should you have a fault, Openreach can take up to 3 days to fix a line with Level 1 Maintenance, but will fix the fault within 6 hours for a line with Level 4 Maintenance. Typically, most providers only include Level 1 in their monthly charge. In some cases, this may be suitable, however if your line is connected to your alarm system, then you will likely require a more responsive Service Level”.


What is a leased line? 

A leased line is a private line that can exist between two offices or an office and a data server. Because a leased line is private, it means the bandwidth can only be used by your business, which means you benefit from faster download speeds, upload speeds, and a more reliable connection. Businesses can use a leased line to connect to the internet, link servers, and carry phone calls. 

What’s the difference between fibre and ADSL?

While fibre broadband is delivered through fibre optic cable, ADSL (Asymmetric Digital Subscriber Line, is delivered through the standard copper phone line. Fibre is faster and more reliable than ADSL, and is now the preferred choice for households and businesses despite being more expensive than ADSL. 

Generally, with ADSL the further away you live from the telephone exchange, the slower and less reliable your connection. However, with fibre, fibre-optic cable delivers data from the telephone exchange to a local cabinet. The data journey then finishes along a copper phone line from the cabinet to your premise, so it has less far to travel at a slower speed. 

What’s the difference between FTTC and FTTP?

FTTC stands for Fibre to the Cabinet, while FTTP stands for Fibre to the Premises. FTTC means data is delivered from the telephone exchange to the local cabinet, where it then continues its journey along a standard copper line. FTTP means the fibre connection continues straight to your business premises from the exchange, which means you benefit from much faster download and upload speeds. 

What is VoIP?

VoIP stands for Voice over Internet Protocol. It means that your voice data is turned into digital data and is sent over the internet, rather than the traditional telephone line. Because VoIP is a digital telephone service, businesses can invest in software that gives you greater control over your calls, including call recording, call forwarding, and the option to record an auto-attendant.

What is a PBX?

PBX stands for Private Branch Exchange. It’s a piece of technology that allows you to direct calls to a specific phone or department phone network. A PBX can either be cloud-based or on-premise. A cloud-based PBX manages your calls on an off-site server, while an on-premise PBX directs your calls once the call has reached your on-site server. 

What is a virtual phone number?

A virtual number isn’t directly associated with a phone line. Instead, it’s a cloud-based number that acts as a getaway to a forwarding network. When a person calls the number, it forwards the call to a pre-set phone number, and from that point, uses either the digital or traditional phone line to manage the call. 

A virtual number enables a business to appear in a specific location. For example, a business can appear to have a London number. When a person calls the number, the call is then automatically forwarded to the business’ fixed number. You can find out more about how virtual landlines work on our dedicated virtual landlines page. 

Complete our quick quiz!

If you want to be sure that you’re investing in the right phone line for your business…

  1. Answer a few questions so we know the kind of phone service you’re looking for
  2. Receive a list of providers that suit your needs
  3. Compare zero obligation quotes

Aimee Bradshaw Senior Writer

Aimee is Startups' resident expert in business tech, products, and services. She loves a great story and enjoys chatting to the startups and small business community. Starting her own egg delivery business from the age of 12, she has a healthy respect for self-starters and local services.

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