KDDI, which serves over 31 million users across Japan, was hit by a widespread outage beginning on Saturday, July 2 at 01:35am local time.
KDDI attributed the initial fault to regular maintenance procedures involving the replacement of a router. Cascading errors led to disruption of other core elements, including its VoLTE platform.
Rakuten Mobile users were also hit by the outage due to carriage agreements between the firms
As of Monday, July 4, the network had not yet fully recovered.
httpxs://news.kddi.com/important/news/important_202207051020.html
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