Spoofing unused codes
There are a lot of unallocated dialling codes in the UK.
I have had calls (Indian accent but that simply helps confirm things) from what appears to the uninitiated as a call from a UK landline, but a quick check showed the dialling code was not actually used.
A pretty common trick used by would be scammers (We often get the "This is Microsoft calling about your computer" - quite amusing when I tell them I design computers for a living and besides, the computer is currently turned off).
Biting the hand that feeds IT
