Total O2 outage paralyzes Czechia. Calls and internet not working

Users of O2 mobile services have been reporting a widespread outage of the entire mobile network since this Monday morning. People across the country are experiencing problems with calls, sending SMS messages, and mobile internet. For some customers, only “Emergency calls only” is displayed on the screen, while for others, services are working intermittently. The operator has already confirmed on social media that they are aware of the problem and are working to resolve it.

What exactly is not working?

According to customer feedback from the Downdetector platform, practically the entire mobile network is not working – calls, SMS, and data services. “No signal on my mobile, I can’t make calls,” writes a user from Olomouc, for example. Similar experiences are reported by people from Prague, České Budějovice, Hradec Králové, and other cities. Interestingly, O2 fixed internet connection remains functional, as confirmed by some customers: “5G network went down, Prague Stodůlky. Fixed fiber internet is fine.”

Uneven impact of the outage

The situation is not the same for all users. Some report a complete loss of signal, while others experience intermittent service functionality. “It changes continuously. I have two cards in my mobile. The second one for data. I have a signal on that one, and on the first SIM card (calls, SMS,…), I have a signal for a while and then not for a long time,” describes one customer. Another user adds: “Interestingly, out of three devices I currently have connected to O2 (mobile, work mobile, tablet), two only show emergency calls and a restart didn’t help, the third one is still holding connection.”

Official operator response

O2, via its O2 Guru account on the social network X, confirmed that it is aware of the problem: “We are currently experiencing issues with callability and data for some customers. We are investigating the situation and working on a solution. We apologize for the inconvenience,” the operator stated in a reply to one user. However, the company has not yet provided more detailed information about the cause of the outage or the estimated time of service restoration.

@Georgo10 Dobrý den, děkujeme za vaši zprávu. Aktuálně evidujeme potíže s dovolatelností a daty u některých zákazníků. Situaci prověřujeme a pracujeme na řešení. Omlouváme se za nepříjemnosti.
Domča, O2 Guru

— O2 Guru CZ (@O2GuruCZ) August 4, 2025

What to do if your mobile network is not working?

If you are among the affected customers, restarting your phone will likely not help in this case, as many users confirm. The only way to stay connected is to connect to a Wi-Fi network and use alternative communication apps like WhatsApp, Messenger, or Telegram.

Total O2 outage paralyzes Czechia. Calls and internet not working Jakub Kárník News Jakub Kárník News

According to the latest comments, the network is starting to gradually come back online for some users, which could indicate that O2 technicians are already partially resolving the issue. However, the situation is still changing, and many customers remain without services even after more than an hour and a half since the outage began.

Are you also experiencing problems with O2 mobile services?

Source: Downdetector, O2 (X)