O2’s internet service is down, leaving customers of the network unable to get online.
The problems mean those companies that share its network – such as GiffGaff and Tesco Mobile – are also being hit by the problems.
Calls can still be made by customers despite 4G data connections are broken, O2 said.
Affected phones, which may be every single device registered to the network, simply fail to show any kind of data connection and will not connect even when turned off and back on or when other workarounds are tried, according to users experiencing the problems.
Some users also suggested SMS messaging was not working, leaving them unable to send texts.
1/42
5G wireless internet is expected to launch in 2019, with the potential to reach speeds of 50mb/s
Getty
2/42
Uber has halted testing of driverless vehicles after a woman was killed by one of their cars in Tempe, Arizona. March 19 2018
Getty
3/42
Designed by Pierpaolo Lazzarini from Italian company Jet Capsule. The I.F.O. is fuelled by eight electric engines, which is able to push the flying object to an estimated top speed of about 120mph
Jet Capsule/Cover
4/42
A humanoid robot gestures during a demo at a stall in the Indian Machine Tools Expo, IMTEX/Tooltech 2017 held in Bangalore
Getty
5/42
A humanoid robot gestures during a demo at a stall in the Indian Machine Tools Expo, IMTEX/Tooltech 2017 held in Bangalore
Getty
6/42
Engineers test a four-metre-tall humanoid manned robot dubbed Method-2 in a lab of the Hankook Mirae Technology in Gunpo, south of Seoul, South Korea
Jung Yeon-Je/AFP/Getty
7/42
Engineers test a four-metre-tall humanoid manned robot dubbed Method-2 in a lab of the Hankook Mirae Technology in Gunpo, south of Seoul, South Korea
Jung Yeon-Je/AFP/Getty
8/42
The giant human-like robot bears a striking resemblance to the military robots starring in the movie ‘Avatar’ and is claimed as a world first by its creators from a South Korean robotic company
Jung Yeon-Je/AFP/Getty
9/42
Engineers test a four-metre-tall humanoid manned robot dubbed Method-2 in a lab of the Hankook Mirae Technology in Gunpo, south of Seoul, South Korea
Jung Yeon-Je/AFP/Getty
10/42
Waseda University’s saxophonist robot WAS-5, developed by professor Atsuo Takanishi
Rex
11/42
Waseda University’s saxophonist robot WAS-5, developed by professor Atsuo Takanishi and Kaptain Rock playing one string light saber guitar perform jam session
Rex
12/42
A test line of a new energy suspension railway resembling the giant panda is seen in Chengdu, Sichuan Province, China
Reuters
13/42
A test line of a new energy suspension railway, resembling a giant panda, is seen in Chengdu, Sichuan Province, China
Reuters
14/42
A concept car by Trumpchi from GAC Group is shown at the International Automobile Exhibition in Guangzhou, China
Rex
15/42
A Mirai fuel cell vehicle by Toyota is displayed at the International Automobile Exhibition in Guangzhou, China
Reuters
16/42
A visitor tries a Nissan VR experience at the International Automobile Exhibition in Guangzhou, China
Reuters
17/42
A man looks at an exhibit entitled ‘Mimus’ a giant industrial robot which has been reprogrammed to interact with humans during a photocall at the new Design Museum in South Kensington, London
Getty
18/42
A new Israeli Da-Vinci unmanned aerial vehicle manufactured by Elbit Systems is displayed during the 4th International conference on Home Land Security and Cyber in the Israeli coastal city of Tel Aviv
Getty
19/42
Electrification Guru Dr. Wolfgang Ziebart talks about the electric Jaguar I-PACE concept SUV before it was unveiled before the Los Angeles Auto Show in Los Angeles, California, U.S
Reuters
20/42
The Jaguar I-PACE Concept car is the start of a new era for Jaguar. This is a production preview of the Jaguar I-PACE, which will be revealed next year and on the road in 2018
AP
21/42
Japan’s On-Art Corp’s CEO Kazuya Kanemaru poses with his company’s eight metre tall dinosaur-shaped mechanical suit robot ‘TRX03’ and other robots during a demonstration in Tokyo, Japan
Reuters
22/42
Japan’s On-Art Corp’s eight metre tall dinosaur-shaped mechanical suit robot ‘TRX03’
Reuters
23/42
Japan’s On-Art Corp’s eight metre tall dinosaur-shaped mechanical suit robot ‘TRX03’ performs during its unveiling in Tokyo, Japan
Reuters
24/42
Singulato Motors co-founder and CEO Shen Haiyin poses in his company’s concept car Tigercar P0 at a workshop in Beijing, China
Reuters
25/42
The interior of Singulato Motors’ concept car Tigercar P0 at a workshop in Beijing, China
Reuters
26/42
Singulato Motors’ concept car Tigercar P0
Reuters
27/42
A picture shows Singulato Motors’ concept car Tigercar P0 at a workshop in Beijing, China
Reuters
28/42
Connected company president Shigeki Tomoyama addresses a press briefing as he elaborates on Toyota’s “connected strategy” in Tokyo.
The Connected company is a part of seven Toyota in-house companies that was created in April 2016
Getty
29/42
A Toyota Motors employee demonstrates a smartphone app with the company’s pocket plug-in hybrid (PHV) service on the cockpit of the latest Prius hybrid vehicle during Toyota’s “connected strategy” press briefing in Tokyo
Getty
30/42
An exhibitor charges the battery cells of AnyWalker, an ultra-mobile chasis robot which is able to move in any kind of environment during Singapore International Robo Expo
Getty
31/42
A robot with a touch-screen information apps stroll down the pavillon at the Singapore International Robo Expo
Getty
32/42
An exhibitor demonstrates the AnyWalker, an ultra-mobile chasis robot which is able to move in any kind of environment during Singapore International Robo Expo
Getty
33/42
Robotic fishes swim in a water glass tank displayed at the Korea pavillon during Singapore International Robo Expo
Getty
34/42
An employee shows a Samsung Electronics’ Gear S3 Classic during Korea Electronics Show 2016 in Seoul, South Korea
Reuters
35/42
Visitors experience Samsung Electronics’ Gear VR during the Korea Electronics Grand Fair at an exhibition hall in Seoul, South Korea
Getty
36/42
Amy Rimmer, Research Engineer at Jaguar Land Rover, demonstrates the car manufacturer’s Advanced Highway Assist in a Range Rover, which drives the vehicle, overtakes and can detect vehicles in the blind spot, during the first demonstrations of the UK Autodrive Project at HORIBA MIRA Proving Ground in Nuneaton, Warwickshire
PA wire
37/42
Chris Burbridge, Autonomous Driving Software Engineer for Tata Motors European Technical Centre, demonstrates the car manufacturer’s GLOSA V2X functionality, which is connected to the traffic lights and shares information with the driver, during the first demonstrations of the UK Autodrive Project at HORIBA MIRA Proving Ground in Nuneaton, Warwickshire
PA wire
38/42
Ford EEBL Emergency Electronic Brake Lights is demonstrated during the first demonstrations of the UK Autodrive Project at HORIBA MIRA Proving Ground in Nuneaton, Warwickshire
PA
39/42
Full-scale model of ‘Kibo’ on display at the Space Dome exhibition hall of the Japan Aerospace Exploration Agency (JAXA) Tsukuba Space Center, in Tsukuba, north-east of Tokyo, Japan
EPA
40/42
Miniatures on display at the Space Dome exhibition hall of the Japan Aerospace Exploration Agency (JAXA) Tsukuba Space Center, in Tsukuba, north-east of Tokyo, Japan.
In its facilities, JAXA develop satellites and analyse their observation data, train astronauts for utilization in the Japanese Experiment Module ‘Kibo’ of the International Space Station (ISS) and develop launch vehicles
EPA
41/42
The robot developed by Seed Solutions sings and dances to the music during the Japan Robot Week 2016 at Tokyo Big Sight. At this biennial event, the participating companies exhibit their latest service robotic technologies and components
Getty
42/42
The robot developed by Seed Solutions sings and dances to music during the Japan Robot Week 2016 at Tokyo Big Sight
Getty
1/42
5G wireless internet is expected to launch in 2019, with the potential to reach speeds of 50mb/s
Getty
2/42
Uber has halted testing of driverless vehicles after a woman was killed by one of their cars in Tempe, Arizona. March 19 2018
Getty
3/42
Designed by Pierpaolo Lazzarini from Italian company Jet Capsule. The I.F.O. is fuelled by eight electric engines, which is able to push the flying object to an estimated top speed of about 120mph
Jet Capsule/Cover
4/42
A humanoid robot gestures during a demo at a stall in the Indian Machine Tools Expo, IMTEX/Tooltech 2017 held in Bangalore
Getty
5/42
A humanoid robot gestures during a demo at a stall in the Indian Machine Tools Expo, IMTEX/Tooltech 2017 held in Bangalore
Getty
6/42
Engineers test a four-metre-tall humanoid manned robot dubbed Method-2 in a lab of the Hankook Mirae Technology in Gunpo, south of Seoul, South Korea
Jung Yeon-Je/AFP/Getty
7/42
Engineers test a four-metre-tall humanoid manned robot dubbed Method-2 in a lab of the Hankook Mirae Technology in Gunpo, south of Seoul, South Korea
Jung Yeon-Je/AFP/Getty
8/42
The giant human-like robot bears a striking resemblance to the military robots starring in the movie ‘Avatar’ and is claimed as a world first by its creators from a South Korean robotic company
Jung Yeon-Je/AFP/Getty
9/42
Engineers test a four-metre-tall humanoid manned robot dubbed Method-2 in a lab of the Hankook Mirae Technology in Gunpo, south of Seoul, South Korea
Jung Yeon-Je/AFP/Getty
10/42
Waseda University’s saxophonist robot WAS-5, developed by professor Atsuo Takanishi
Rex
11/42
Waseda University’s saxophonist robot WAS-5, developed by professor Atsuo Takanishi and Kaptain Rock playing one string light saber guitar perform jam session
Rex
12/42
A test line of a new energy suspension railway resembling the giant panda is seen in Chengdu, Sichuan Province, China
Reuters
13/42
A test line of a new energy suspension railway, resembling a giant panda, is seen in Chengdu, Sichuan Province, China
Reuters
14/42
A concept car by Trumpchi from GAC Group is shown at the International Automobile Exhibition in Guangzhou, China
Rex
15/42
A Mirai fuel cell vehicle by Toyota is displayed at the International Automobile Exhibition in Guangzhou, China
Reuters
16/42
A visitor tries a Nissan VR experience at the International Automobile Exhibition in Guangzhou, China
Reuters
17/42
A man looks at an exhibit entitled ‘Mimus’ a giant industrial robot which has been reprogrammed to interact with humans during a photocall at the new Design Museum in South Kensington, London
Getty
18/42
A new Israeli Da-Vinci unmanned aerial vehicle manufactured by Elbit Systems is displayed during the 4th International conference on Home Land Security and Cyber in the Israeli coastal city of Tel Aviv
Getty
19/42
Electrification Guru Dr. Wolfgang Ziebart talks about the electric Jaguar I-PACE concept SUV before it was unveiled before the Los Angeles Auto Show in Los Angeles, California, U.S
Reuters
20/42
The Jaguar I-PACE Concept car is the start of a new era for Jaguar. This is a production preview of the Jaguar I-PACE, which will be revealed next year and on the road in 2018
AP
21/42
Japan’s On-Art Corp’s CEO Kazuya Kanemaru poses with his company’s eight metre tall dinosaur-shaped mechanical suit robot ‘TRX03’ and other robots during a demonstration in Tokyo, Japan
Reuters
22/42
Japan’s On-Art Corp’s eight metre tall dinosaur-shaped mechanical suit robot ‘TRX03’
Reuters
23/42
Japan’s On-Art Corp’s eight metre tall dinosaur-shaped mechanical suit robot ‘TRX03’ performs during its unveiling in Tokyo, Japan
Reuters
24/42
Singulato Motors co-founder and CEO Shen Haiyin poses in his company’s concept car Tigercar P0 at a workshop in Beijing, China
Reuters
25/42
The interior of Singulato Motors’ concept car Tigercar P0 at a workshop in Beijing, China
Reuters
26/42
Singulato Motors’ concept car Tigercar P0
Reuters
27/42
A picture shows Singulato Motors’ concept car Tigercar P0 at a workshop in Beijing, China
Reuters
28/42
Connected company president Shigeki Tomoyama addresses a press briefing as he elaborates on Toyota’s “connected strategy” in Tokyo.
The Connected company is a part of seven Toyota in-house companies that was created in April 2016
Getty
29/42
A Toyota Motors employee demonstrates a smartphone app with the company’s pocket plug-in hybrid (PHV) service on the cockpit of the latest Prius hybrid vehicle during Toyota’s “connected strategy” press briefing in Tokyo
Getty
30/42
An exhibitor charges the battery cells of AnyWalker, an ultra-mobile chasis robot which is able to move in any kind of environment during Singapore International Robo Expo
Getty
31/42
A robot with a touch-screen information apps stroll down the pavillon at the Singapore International Robo Expo
Getty
32/42
An exhibitor demonstrates the AnyWalker, an ultra-mobile chasis robot which is able to move in any kind of environment during Singapore International Robo Expo
Getty
33/42
Robotic fishes swim in a water glass tank displayed at the Korea pavillon during Singapore International Robo Expo
Getty
34/42
An employee shows a Samsung Electronics’ Gear S3 Classic during Korea Electronics Show 2016 in Seoul, South Korea
Reuters
35/42
Visitors experience Samsung Electronics’ Gear VR during the Korea Electronics Grand Fair at an exhibition hall in Seoul, South Korea
Getty
36/42
Amy Rimmer, Research Engineer at Jaguar Land Rover, demonstrates the car manufacturer’s Advanced Highway Assist in a Range Rover, which drives the vehicle, overtakes and can detect vehicles in the blind spot, during the first demonstrations of the UK Autodrive Project at HORIBA MIRA Proving Ground in Nuneaton, Warwickshire
PA wire
37/42
Chris Burbridge, Autonomous Driving Software Engineer for Tata Motors European Technical Centre, demonstrates the car manufacturer’s GLOSA V2X functionality, which is connected to the traffic lights and shares information with the driver, during the first demonstrations of the UK Autodrive Project at HORIBA MIRA Proving Ground in Nuneaton, Warwickshire
PA wire
38/42
Ford EEBL Emergency Electronic Brake Lights is demonstrated during the first demonstrations of the UK Autodrive Project at HORIBA MIRA Proving Ground in Nuneaton, Warwickshire
PA
39/42
Full-scale model of ‘Kibo’ on display at the Space Dome exhibition hall of the Japan Aerospace Exploration Agency (JAXA) Tsukuba Space Center, in Tsukuba, north-east of Tokyo, Japan
EPA
40/42
Miniatures on display at the Space Dome exhibition hall of the Japan Aerospace Exploration Agency (JAXA) Tsukuba Space Center, in Tsukuba, north-east of Tokyo, Japan.
In its facilities, JAXA develop satellites and analyse their observation data, train astronauts for utilization in the Japanese Experiment Module ‘Kibo’ of the International Space Station (ISS) and develop launch vehicles
EPA
41/42
The robot developed by Seed Solutions sings and dances to the music during the Japan Robot Week 2016 at Tokyo Big Sight. At this biennial event, the participating companies exhibit their latest service robotic technologies and components
Getty
42/42
The robot developed by Seed Solutions sings and dances to music during the Japan Robot Week 2016 at Tokyo Big Sight
Getty
“Our technical teams are investigating reports of issues when using data,” O2 wrote on its status page. ”Voice calls are working OK. Our technical teams are investigating. We apologise for any inconvenience. Updates will be shared here as soon they are available.”
That page itself appeared to be having issues, often failing to load.
A tool on the same page that allows users to check if the outage is happening in their area did not appear to be working, bringing up an error message saying that the system was having “technical problems” but that “engineers have been notified”.
The problems were happening across the UK, according to the website Down Detector.
O2’s Twitter account spent the morning replying to users who were having issues with data. The messages made clear they were aware of the issues, said they were being fixed, and apologised for any problems caused.