Vodafone's services, including mobile coverage and internet, were disrupted in the UK, leaving millions disconnected.
The outage started on Monday at 14:25 BST and peaked 30 minutes later, with nearly 140,000 customers reporting issues on Downdetector.co.uk.
Vodafone is down. Landline internet, mobile internet, website... It's not just DNS, as ping also fails.
A reader noted that the issue seemed more serious than a simple DNS problem, but the cause remains unclear.
Vodafone has yet to respond to requests for more information.
A multi-network roaming SIM provider warned of an "ongoing issue with the Vodafone UK Network."
Author's summary: Vodafone's UK services were disrupted, affecting millions.