Part of BT's phone service was knocked out earlier today causing disruption for some of the UK's biggest companies.
Details are still sketchy but it is understood that the problem has hit a number of BT's major corporate customers that run call centres to communicate with their punters.
The fault lies with BT's Intelligent Call Management (ICM) system and means that some people will be unable to contact companies on numbers beginning 0845 or 0800.
Those hit include banks, building societies, insurance companies and utilities.
Engineers are currently working to resolve the problem although at this stage it's not known when the ICM system will be fixed. ®