The network to keep you working

Our award-winning mobile network is the lifeblood of O2


5G and business

One of the biggest opportunities for 5G is its potential to transform businesses. 5G is more than just pure connectivity. It has the potential to transform every sector it touches.


This new technology has the power to connect buildings, transport and services in ways we’ve never seen, completely revolutionising everything from the way traffic flows on our roads, to the way we receive health care.


Find out more




Putting mobile first

We are the largest UK network with over 32.6 million customers. Everyone is welcome. When you join, your people do too. You get access to an award-winning network, voted for by customers, giving your workforce more ways to stay connected.


We’ve always been ‘mobile first’. That’s why we’re at heart of the digital revolution, driving what’s possible for people and businesses across the UK.


Find out more 



A secure network for business

O2 was the first UK mobile network to be CAS(T) certified, so you can be sure so you can be sure your communications are on an entirely secure platform.


We’re proud to have gained approval to deliver critical national infrastructure projects for the UK government, following an 18-month accreditation process. CAS(T) also gives private companies military-grade security for their communications, helping address growing cyber security threats.


Find out more


We’re proud of our network

We were the winners of uSwitch’s Best Network for Coverage award in 20191, voted for by customers.

We’re the biggest mobile network in the UK, with over 32.6 million customers. This includes our customers plus those of giffgaff, Tesco Mobile, Sky Mobile and Lycamobile, which all use our network.

We’re investing in our network experience with 80Mhz of new spectrum to increase capacity and pave the way for 5G.

We’re the only UK network to have made and kept a 4G UK population coverage commitment to Ofcom. We now cover 98% of the UK population indoors.

We’re rated as the best performing network for reliability, following research conducted by Global Wireless Solutions (GWS) in 2018.

We’ve invested in our network with a focus on each and every customer’s individual network experience. Making sure we meet your ever-growing connectivity needs.

Keeping UK PLC connected 

We are fundamental to the infrastructure of UK PLC, putting us right at the heart of digital Britain.

From local businesses to the public sector, we’re a trusted partner to help underpin your business and your customer experience. 

Our network infrastructure supports over a third of all UK councils. We were the first operator to achieve CAS(T) Certification for mobile voice and data, and have been awarded ‘highly secure’ on the way we hold data. And we’re even helping to keep your safe. We monitor over 16,000 offender tags for the Ministry of Justice.  

We support our Emergency Services. Over half of the UK police forces, 12 ambulance services and four fire services rely on our network to deliver the response you need, when you need it. 

We provide Network Rail with mobile services that allow them to do everything from maintaining the rail tracks safely, to monitoring level crossings.

The AA uses our network to stay connected to their customers, making sure no one is left out in the cold. And Transport for London has all 8500 London buses connected every 30 seconds. Providing real-time updates on the timing of the next bus. 

We support the UK Power Network in delivering electricity to 18 million homes across London, the South East and East of England, every single day. And we’ve been selected as the Connectivity Service Provider for the Government’s Smart Metering Programme, providing 23.5 million comms hubs in UK homes. 

We’re proud of our network. We’re continuing to invest over £1.5 million in it every day. Helping our business support your business, better. 

5G-enabled smart city

It’s coming, but what will a 5G-enabled smart city look like?

A little bit more info

Watch our video on how O2’s 4G connectivity is making a big difference.