WhatsApp users around the world are reporting problems with the messaging app.
Reports show outages across the UK, including in London and Manchester.
There are also reports of problems in other parts of Europe, including Spain and Germany, and the US.
Users in Mexico and South America are also affected.
Dozens of people have also taken to Twitter to report problems.
One wrote: "Yay! #WhatsappDown. Now we can chat the old school way..."
Another said: "C’mon @WhatsApp, sort it out #whatsappdown."
WhatsApp has not yet commented on the reports.
