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Ericsson generally offers managed services, and so it's likely it was their responsibility. Also, this is reflected by O2 seeking damages.

• walshemj 8y ago
  It apparently only effected a new software release - so its down to Ericson in this case.
• lovemenot 8y ago
  This is supported by the fact that Softbank in Japan experiened a similar network outage at the same time. They too blame Ericsson.