Vodafone's mobile network has been restored after a technical fault meant some customers had issues making calls.
A statement on the company's website said nationwide issues with its mobile network began about 9.30am.
Some customers using the 2G, 3G and 4G network experienced issues with calls connecting.
This afternoon, Vodafone said its calling, texting and data services had now been fully restored.
"We sincerely apologise to our customers for any inconvenience caused. We will continue to monitor services closely throughout the day."