Vodafone Australia are experiencing a mass outage across the country, impacting those trying to make calls and use data.

The carrier said the issue was affecting 4G services and data services may be falling back to 3G intermittently, causing swampy speeds.

It’s not yet known what’s caused it.

Want more? Here's one of our fave moments from Jase & PJ – they’re always up to something! Weekdays from 6AM on KIIS 101.1!