The Three mobile phone network has said some of its customers may have been experiencing issues with their service today.

A spokesperson for Three Ireland said the problems with the mobile network today happened due to an electrical failure at one of the company's data centres.

The spokesperson said the electrical failure caused an increase in temperature in the building, and then subsequently impacted some systems affecting customer service.

Three Ireland said some customers are still experiencing intermittent 2G and 3G service issues.

The spokesperson added Three's Networks team is continuing to work hard to resolve this as soon as possible.

The company has apologised for any inconvenience caused.

Three, which recently took over 02's business in Ireland, has two million customers in the country.

Separately, internet service provider Imagine said some customers of it Wimax services across the country may be experiencing an issue when connecting to the internet.

A recorded message on the company's technical support helpline said its engineers were looking into the problem, and the company apologised for any inconvenience caused.

Imagine posted a message about the problem to its twitter feed yesterday, with a further tweet this morning.

However, one customer told RTÉ News that the problem first arose on Friday afternoon.