Japanese mobile telco operator KDDI said on Tuesday its network is back up and running, after the carrier experienced a nationwide system failure affecting millions of customers over the weekend. KDDI blamed equipment failure for the problem – specifically, Voice over LTE (VoLTE) traffic congestion was disrupted "due to a facility failure before dawn" on Saturday, July 2nd. To mitigate, KDDI took measures to reduce load on the VoLTE switch and correct what it referred to as "data inconsistencies."