UPDATE 14:04 All key areas are now performing as expected and any backlog has caught up. However, should you come across any issues, don't hesitate to let us know. We'll be continuing to monitor all systems as normal.
UPDATE 11:13 Some areas of the system are now fully operational. Key areas where performance is impacted are the control panel, call statistics not updating (there is a back log that will catch up over the next couple of days), emails for services like Voicemail and Missed Call Alerts (again these are queued and will be sent in due course).
Sorry for the inconvenience. We'll continue to update via this page.