Cellular network operator O2 on Friday said its data networks had been restored after millions of smartphones across the UK and Japan were taken offline yesterday (via BBC).

A statement on its website said the 4G network was finally working again, after having been affected from about 05:30 GMT on Thursday.

o2 ericsson
Earlier, mobile network equipment supplier Ericsson said that an expired certificate was the reason behind the outage, which also created problems in several other countries. Ericsson UK boss Marielle Lindgren said the "faulty software" that had caused the issues was being decommissioned.

Both O2 and Ericsson issued a joint apology to millions of customers hit by the disruption. "I want to let our customers know how sorry I am for the impact our network data issue has had on them, and reassure them that our teams, together with Ericsson, are doing everything we can," said O2 boss Mark Evans. "We fully appreciate it's been a poor experience and we are really sorry."

O2 is owned by Spain's Telefonica and has the UK's second-largest mobile network after British Telecom subsidiary EE.

The company said voice calls were not affected by the problem, but some O2 customers said they could not make calls or send texts, despite having cellular reception.

The outage also had knock-on effects for other services that use the O2 network, such as Transport for London's electronic timetable service at bus stops, which stopped working for most of Thursday.

Top Rated Comments

fullfast Avatar
74 months ago
Vodafone is the Verizon of the UK. I’ve tested all the networks and for me it was the best by far. Glad O2 is good for you
30 million total impacted by it and all because some dope forgot to renew a certificate so it expired.....that is just pi$$ poor management

Luckily for me I am on both Vodafone and o2 so minimal impact but it does just show how reliant we are now on being able to access internet services.......rewind 15 years....you were lucky if you could receive texts let alone look at what some dog or cat is doing on insta :)
Score: 4 Votes (Like | Disagree)
BMcCoy Avatar
74 months ago
As frustrating as yesterday’s outage was, I still think we do quite well in the U.K. for our cellular deals, whether calls or data. We pay about a quarter of what it costs in the US.
Score: 4 Votes (Like | Disagree)
jimthing Avatar
74 months ago
I moved from O2 to EE when I got a Series 4 on launch. Very happy. My wife and kids are on O2 still, and I didn't hear from them all day yesterday. Who do I send the thank you letter to?
Here's the address:

(FAO) 'Men escaping constant annoying trivial family calls' dept
Santa Claus
iCloud
Earth
Space
Universe
Score: 3 Votes (Like | Disagree)
NoFace1006 Avatar
74 months ago
Vodafone is much better.
You're joking aren't you?! Although I should say that everyone has different experiences and it depends where you live, etc. Had several family members on Vodafone over the years and it's always been terrible for data, particularly data reception more so than the speed. In the end everyone has moved over to other networks, I've been with 3 for 18 months after switching from O2's network, couldn't be happier. Went to the top of Scotland to visit family, a no reception area for most networks in places, I was the only family member with signal and data access.
Score: 3 Votes (Like | Disagree)
coumerelli Avatar
74 months ago
They apologize by you still get billed for the time it was out I bet...
Yeah. All 0.17£/€/¥. lol
Score: 2 Votes (Like | Disagree)
roar08 Avatar
74 months ago
It'll be interesting to find out of this tantalizing Mac rumor turns out to be true.
Score: 2 Votes (Like | Disagree)

Popular Stories

iPhone 17 Plus Feature

iPhone 17 Lineup Specs Detail Display Upgrade and New High-End Model

Monday July 22, 2024 4:33 am PDT by
Key details about the overall specifications of the iPhone 17 lineup have been shared by the leaker known as "Ice Universe," clarifying several important aspects of next year's devices. Reports in recent months have converged in agreement that Apple will discontinue the "Plus" iPhone model in 2025 while introducing an all-new iPhone 17 "Slim" model as an even more high-end option sitting...
iPhone SE 4 Vertical Camera Feature

iPhone SE 4 Production Will Reportedly Begin Ramping Up in October

Tuesday July 23, 2024 2:00 pm PDT by
Following nearly two years of rumors about a fourth-generation iPhone SE, The Information today reported that Apple suppliers are finally planning to begin ramping up mass production of the device in October of this year. If accurate, that timeframe would mean that the next iPhone SE would not be announced alongside the iPhone 16 series in September, as expected. Instead, the report...
iPhone 17 Plus Feature Purple

These 5 Features Will Make the iPhone 17 the Biggest Update in Years

Monday July 22, 2024 4:02 pm PDT by
The upcoming iPhone 16 models that we're expecting to see in September are going to be quite similar to the iPhone 15 models, but rumors suggest that Apple is making big changes in 2025. We've been hearing hints of an all-new device in the iPhone lineup, and it may be the most expensive iPhone Apple has offered to date. New 'Slim' Design Rumors have taken to referring to the new iPhone 17...
Apple TV Plus Feature 2 Magenta and Blue

Apple TV+ Curbs Costs After Expensive Projects Fail to Capture Viewers

Monday July 22, 2024 5:11 am PDT by
Apple is scaling back its Hollywood spending after investing over $20 billion in original programming with limited success, Bloomberg reports. This shift comes after the streaming service, which launched in 2019, struggled to capture a significant share of the market, accounting for only 0.2% of TV viewership in the U.S., compared to Netflix's 8%. Despite heavy investment, critical acclaim,...
iPhone SE 4 Thumb 1

iPhone SE 4 Rumored to Launch Early Next Year With OLED Display, 48MP Camera, and More

Monday July 22, 2024 7:22 am PDT by
The fourth-generation iPhone SE will offer a series of major upgrades over the current model, the leaker known as "Ice Universe" claims. The information was listed in a post on Weibo, which also detailed the specifications of the iPhone 17 lineup. As previously rumored, the fourth-generation iPhone SE is expected to feature Face ID and USB-C, marking a major upgrade from current and previous ...
bsod

Microsoft Blames European Commission for Major Worldwide Outage

Monday July 22, 2024 11:55 am PDT by
Last Friday, a major CrowdStrike outage impacted PCs running Microsoft Windows, causing worldwide issues affecting airlines, retailers, banks, hospitals, rail networks, and more. Computers were stuck in continuous recovery loops, rendering them unusable. The failure was caused by an update to the CrowdStrike Falcon antivirus software that auto-installed on Windows 10 PCs, but Mac and Linux...
iPhone 16 Pro Sizes Feature

iPhone 16 Series Is Just Two Months Away: Everything We Know

Monday July 15, 2024 4:44 am PDT by
Apple typically releases its new iPhone series around mid-September, which means we are about two months out from the launch of the iPhone 16. Like the iPhone 15 series, this year's lineup is expected to stick with four models – iPhone 16, iPhone 16 Plus, iPhone 16 Pro, and iPhone 16 Pro Max – although there are plenty of design differences and new features to take into account. To bring ...
iOS 18 on iPhone Feature

Everything New in iOS 18 Beta 4

Tuesday July 23, 2024 1:08 pm PDT by
Apple released the fourth beta of iOS 18 today, introducing small changes to a number of features throughout the operating system. There are no big additions in this beta, but Apple is continuing to refine existing settings and design choices. Apple plans to continue updating iOS 18 over the next few months, with the update set to be released this fall. We've rounded up all of the changes...