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BT One Phone Office


Hosted phone system for businesses that want mobility both in the office and outside



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Designed for a business with a mobile workforce and more than 20 employees


BT One Phone Office replaces your desk and mobile phone with a single device. It works by switching you seamlessly between the office and mobile networks whenever you leave the office, so you can carry on calls without interruption even as you walk out of the office.  

Wherever people are, they can always access all the functionality of the office phone system.

And because it’s a cloud-based phone system, you don’t need to worry about the costs associated with on-premises hardware.  

Call us to discuss the right solution for your business

Arrange a consultation with your BT Local Business specialist now.

9am-5pm, Monday-Friday

This is a sales number only. Please use these numbers for faults and technical queries.

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Included as standard

BT One Phone Office portal and app

Manage features and preferences online or on a mobile app.

You and your administrators have complete control over call routing settings so you can keep up with the changing needs of your business.

Any of your new users can get going instantly. They just activate their BT One Phone SIM card at the touch of a button.

Intelligent call routing and call management features

If you’re not available, your calls are directed to someone who is.

Hunt groups/ACD groups can be set up to make sure all calls are answered by the right person.

All the call management features you’d expect from a traditional phone system are available on your mobiles, to help you manage your business calls from wherever you are. You can even record calls if you need to.


Choice of unlimited voice and texts, and flexible costs

Give your people what they need while staying in control of your costs.

Get the choice of unlimited voice and texts available per user, and a selection of company shared bundles.

It’s easy to add and remove extras to your service, so you'll only pay for what you need. You'll get free calls between BT One Phone users in your company.

Dedicated project manager

Get expert customer service from day one.

You’ll have a dedicated project manager who’ll take care of everything before, during, and after installation (including training all your BT One Phone users).

You'll have access to the BT One Phone helpdesk and can report lost or stolen SIMs 24/7.

Free intra-business calls

You'll get free calls between BT One Phone Office users in your company.

Dedicated mobile network in your office

Landline-quality calls from your mobile, with guaranteed coverage and capacity.

Access to 4G and over 5 million BT Wi-fi hotspots

Your people can work outside the office with the same connectivity as within the office.

Optional extras

Call Recording

Record all your mobile and desk-based phone calls.

Record all UK calls made to or from your landline, mobile, or extension number.

Easy to set up and manage through an online portal.

Store recorded calls in BT’s UK-based secure data centres for up to 7 years.

No up-front costs; you only pay a monthly subscription for each user.

Additional phone system functions

Useful features that help you make the most of BT One Phone.

Flexible CLI where you can present an external landline number from your mobile, and if you forward calls from that landline to your mobile, you have the appearance of an integrated mobile and phone system.

Additional phone number.

IVR (Interactive Voice Response - a technology that allows a computer to interact with callers through the use of voice and tones input via keypad).


MobileIron Cloud

Secure and manage all company mobile devices and their data with this industry-leading service.

With MobileIron Cloud, you’ll never worry about the security of your mobile phones and tablets again. You can manage every one from your own online portal – and if a device ever falls into the wrong hands, you can remotely lock it, trace it or wipe it. It’s the easy way to keep customer and business data secure.

  • One simple online portal to control all your mobile devices.
  • Remotely set passwords, switch off functions, manage configurations and restrictions, and more.
  • Create an app catalogue to both recommend and restrict what each user can choose.
  • Peace of mind in case of theft – even if a phone or tablet is stolen, you can make sure no sensitive information is seen or lost.

More about MobileIron Cloud.

Why BT Business?

Get the right solution for your business from BT Local Business experts
Unbeatable local knowledge, national resources, and personal service
Personal contact helps us get to know you and your business challenges
We’re the leading provider of phone systems in the UK, right on your doorstep


Can you guarantee quality of service?

Yes! We’ll design the service to fit the exact way your business works.

We’ll allocate two experts - a BT One Phone voice radio planner and a project manager - who’ll assess each of your sites and come up with the ideal configuration.

This includes making sure the dedicated line into your business has the right capacity and resilience to provide the consistent high quality of service you need. We’ll proactively monitor your service on an ongoing basis too, making sure everything is fine-tuned to support current and future call levels. If you need a service boost (e.g. more data capacity), we’ll work with you to provide this in good time.

How do you make sure my business communications are always working?

BT One Phone Office is backed by advanced disaster recovery measures. Our network is underpinned by fully resilient data centres. These are spread across the country so that if anything ever went wrong at one facility, a second location would automatically keep everything going.

And, because everything’s Cloud-based, your people will always be able to access full office-phone system functionality even if they can’t get into the office - for example, if it's snowing and the roads are a no-go. 

How much does it cost to set up and run the system?

Our pricing is simple and flexible. As every company is different, we design a BT One Phone service specific to each business’s needs. There’s a lot of choice on how you pay too – you can pay more up front or spread payments over a longer period. You can also opt for company-wide bundles of minutes and data to share between all your users, or individual unlimited subscriptions. Simply add and remove extras to your service when you need them – like more data and texts and roaming extras

How do I access my BT One Phone Office portal?

What equipment do I need for BT One Phone Office?

It should be minimal as we'll provide everything you need as part of our service. We'll come and install a dedicated line into your building, as well as at least one 'Pico cell' (a small mobile phone base station - your dedicated on-site mobile network), depending on how your business is set up. The Pico cell is how we make sure you get excellent mobile signal everywhere in your premises.

Can our employees keep their existing phone numbers?

Yes, they'll be able to simply move all desk and mobile numbers across to the BT One Phone Office service

Does BT One Phone Office work on any mobile phone?

Yes. BT One Phone will work with any mobile phone, including your current devices. But, to really get the most from the service, we recommend choosing from our wide range of handsets.

How can I get online help?

For help and user guides please visit online help

Things you need to know

Using your BT One Phone abroad

There are no extra charges when you use your UK allowances in the EU. You can also choose our Business Zone and World Zone options to take your business further.

Travelling in the EU

You can use your BT One Phone in the EU as you would back home. Just stick to your UK limits for voice, text and data and you won’t pay a penny extra. What’s more, when you get a call or a text, you won’t get a charge.

Travelling outside the EU

BT One Phone has two roaming options that let you use your UK allowances for voice, text and data abroad. You can add yours using the BT One Phone portal.

  • Business Zone – the nine most popular business destinations: Australia, Canada, China, India, Israel, New Zealand, Turkey, USA and US Virgin Islands.
  • World Zone – expand roaming to 44 countries outside the EU: Australia, Canada, China, India, Israel, New Zealand, Turkey, USA, US Virgin Islands, Anguilla, Antigua & Barbuda, Argentina, Aruba, Bahamas, Barbados, Brazil, British Virgin Islands, Turks & Caicos Islands, Cayman Islands, Dominica, Kenya, Grenada, Haiti, Hong Kong, Indonesia, Jamaica, Japan, Kuwait, Malaysia, Mexico, Philippines, Puerto Rico, Qatar, Russia, Saudi Arabia, Singapore, South Africa, South Korea, St Kitts & Nevis, St Lucia, St Vincent & the Grenadines, Thailand, Trinidad & Tobago, United Arab Emirates.



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