(Reuters) – Vodafone's Portuguese unit said on Tuesday that an overnight hacker attack had disrupted their services but assured its customers that their personal data had not been compromised as a result of the incident, which is under investigation.
Vodafone Portugal. said in a statement that its system was facing technical problems on Monday night, with thousands of customers reporting that they could not call or access the Internet on their phones or computers.
It was later discovered that the technical problems were caused by what it described as a "deliberate and harmful" cyberattack.
"There is no evidence that customer data has been reached or compromised," it said. "An in-depth investigation into the criminal act … will continue indefinitely, with the involvement of the competent authorities."
The attack on Vodafone came a month after the websites of one of Portugal's largest newspapers and a major broadcaster were hacked. Both media organizations remain unable to access their websites.
Vodafone Portugal said it was "determined to restore the normality of the services" and that mobile phone use was gradually recovering. The 4G network is still unavailable but customers in most of the country can use 3G.