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.
So far, the mobile network company has said that 75 per cent of its network has been restored.
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