Mobile phone company Vodafone has said it is investigating a potential disruption to its fixed and mobile services in Ireland.
It said service teams are working on resolving the issue and will provide updates.
Update: Our service teams are currently working on resolving this issue and we will provide updates shortly. We thank you for your patience as we work to get this fixed.
— Vodafone Ireland (@VodafoneIreland) June 13, 2019
Some customers are complaining about no 4G coverage and disruption to calls.
While similar issues are being reported by customers in the UK, Portugal, Germany, Greece and Italy.
Vodafone UK has said work was underway to solve the glitch but it was unable to give a definitive statement on the extent of the issue.
It is understood the company is re-routing internet traffic to get around the problem.
Issues were first reported before 3.00pm Irish time, according to the outage reporting network Down Detector.
Vodafone Portugal told its customers via Twitter: "Hello, due to technical problems, we are experiencing difficulties in our fixed and mobile services at national level.
"This situation is already in the resolution phase. We regret all inconvenience caused and thank you for understanding."
Olá, devido a problemas técnicos, estamos com dificuldades nos nossos serviços fixo e móvel a nível nacional.
Esta situação já se encontra em fase de resolução.
Lamentamos todos incómodos causados e agradecemos pela compreensão.
— Vodafone Portugal (@VodafonePT) June 13, 2019