Massive O2 internet outage impacts thousands across Czechia

Almost a year after a previous large-scale collapse, thousands of O2 customers have been reporting internet connectivity problems across the Czech Republic since Monday morning.

The first issues – mostly impacting fixed internet connections at home, according to early reports – started emerging shortly before 9 a.m., according to DownDetector, a specialized website that monitors online services outages.

Users in Prague and Brno appear to have been particularly affected, but reports of malfunctions poured in from all over Czechia, including Liberec, Olomouc, Pilsen, Ostrava, Opava, Litoměřice and others.

While some users’ internet access was completely down, others simply reported a slower connection than usual.

By 10 a.m., more than 1,300 individual complaints had already been recorded on the DownDetector server.

“The biggest outage I’ve ever experienced, two hours without access to the O2 network,” one user vented his frustration.

O2 has confirmed the partial collapse. “Due to network damage during excavation works, some customers may currently experience reduced availability of internet services,” O2 press officer Petra Javornická told Novinky.cz earlier this morning.

By noon, "all mobile and landline services are fully functional", O2 press department's later assured. "If problems persist, restarting the device or turning Airplane mode on and off helps."

Just about a year ago in August 2025, tens of thousands of people – about a third of O2 customers in Czechia – also faced a large-scale internet outage as a result of “a software error in the central part of the O2 network”, according to the operator.