Phone networks are down across the US – follow live

(AFP via Getty Images)

Sign up to our free weekly IndyTech newsletter delivered straight to your inbox

Sign up to our free IndyTech newsletter

AT&T has gone down, leaving people unable to make phone calls – including to 911.

The outage at the US’s biggest phone network led to warnings from emergency services and advice from companies to get around the issue.

The problems began early on Thursday. AT&T said it was aware of the issue and working urgently to fix it – but did not give any indication of why it had happened or when it might be resolved.

AT&T has around 250 million customers, making it the US’s biggest phone network by some distance.

Follow for all the latest on the outage below.