The company confirmed the network issues on Twitter, saying: "Our technical teams are investigating reports of issues when using data".
"We'd encourage our customers to use Wifi wherever they can and we apologise for the inconvenience caused".
Downdetector, a website that tracks digital outages, said 1,662 complaints had been made before 7am, with the outages affecting London, Birmingham, Manchester, Glasgow, Leeds and many other towns and cities.
"One of our third party suppliers has identified a global software issue in their system which has impacted us", it said.
O2 is the second largest mobile operator in the United Kingdom; the company says it has around 32 million connections to its network and also hosts virtual network operators, such as Sky Mobile, Lyca Mobile and giffgaff.
O2 has 25 million customers, and supplies network coverage to Sky, Tesco, Giffgaff and Lycamobile, leaving a total of 32 million that use its data.
O2 customers are experiencing problems this morning with data.
Transport for London's live bus timetables rely upon the O2 network.
However, some users are reporting that they're also unable to make voice calls or send text messages, so the full scope of the problem is unclear at present. It said other operators across the world were also affected.
Millions of people have been having problems with their mobile phones this morning, after the O2 network went down. "We are really sorry and working as hard and as fast as we can to fix this".
On most TVs, motion smoothing controls are under advanced picture settings, and each manufacturer has a different name for it. HDTVs that have the feature insert (i.e., interpolate) frames that didn't exist in the source video to smooth out the action.
Those US sanctions have targeted Iran's critical oil sector, as well as several major Iranian banks and other industries. The US is bolstering its military presence in the region, which is already one of the most guarded in the world.
Wilder's trainer Jay Deas said his fighter is desperate for a rematch. "They said it was going to be a boring fight". He added: "If everything is in the paper, I have no desire to discuss anything and let him go fight who he wants".
Only one incident has been reported to police after concertgoers were robbed and assaulted near the FNB stadium . Police arrested one suspect after a mobile phone was stolen, Brigadier Vish Naidoo said.
The aircraft involved had launched from Marine Corps Air Station Iwakuni and were conducting regularly scheduled training. The Marines said in a statement that Japanese search and rescue aircraft responded and were aiding in the rescue effort.
Kris Box says although influenza activity remains at minimal levels, the virus can still cause illness and even death. The most common symptoms of the flu include cold-like symptoms including fever, stuffy nose, body aches and fatigue.
The Chelsea boss will be rotating some players for the game especially with a game against Manchester City coming up next weekend. The club has gone winless across its past six games , last garnering a winning result against Crystal Palace on October 6.
Just a couple of days ago, Bethesda announced that they would be manufacturing replacement canvas bags, as originally advertised. After submitting the tickets, however, the information was passed on to other users thanks to a technical error.
Post-apocalyptic Far Cry to be unveiled tomorrow
The brief teaser trailer begins with a shot of a mushroom cloud extending into the air, seen from a short distance away. Ubisoft call it "a new Far Cry game" but it's not yet clear whether it will be a direct sequel, a spin-off, or what.
George W. Bush handed Michelle Obama something again
Breaking from custom, the current president, Donald Trump , did not speak, per the wishes of the Bush family. The lines of mourners have been steady since the president's casket was brought to Washington Monday.
Boy gets Colorado town to overturn snowball fight ban
The rule was part of an old ordinance outlawing the throwing of missiles, such as stones, at property or people within the town. In this Thursday, Nov. 29, 2018, photograph, 9-year-old Dane Best poses in the council chambers in Severance, Colo .
Christmas turkey, fruitcake rocketing toward space station
It was the first time SpaceX ever failed to land a booster on solid ground, following a string of 12 straight successes. The newest residents will remain on board for six months, while the others will return to Earth on December 20.
United States Life Expectancy Is Down
The suicide death rate in 2017 was the highest it's been in at least 50 years at 47,000, according to government records. For example, scientists are investigating the pain nerve cells to see if there is a way to turn them off directly.
Polio-like illness AFM 'appears to have peaked'
Since the outbreak started, the CDC has been updating both the confirmed case counts and the number of cases under investigation. The younger our children are, and the more helpless and reliant on us they are, the more we worry about their health and safety.