WhatsApp appears to be experiencing technical problems.
Thousands of reports have been made to the 'Down Detector' website - with people saying issues started just before eight this morning.
Many are complaining they can't send or receive messages.
A persistent message is showing for many users at the top of the app, saying it is "connecting" to the server, but then appears to fail to do so.
A spokesperson for the parent company, Meta, says its aware of the outage and is working as quick as possible to resolve the issue.
