Calls from 0800 0664 XXX
Block 0800 0664 XXX is allocated by Ofcom to Magrathea Telecommunications Limited, on the UK Freephone exchange (allocated 2001).
0800 0664 XXX is part of the UK's 080x freephone range. Calls to a freephone number such as 0800 066 4123 are free from both UK landlines and mobiles since Ofcom's 2015 rule change. Freephone numbers are owned by businesses, charities and public bodies; the receiving organisation pays for the call.
This block — 0800 0664 XXX — was allocated by Ofcom to Magrathea Telecommunications Limited in 2001. Magrathea Telecommunications Limited either operates the numbers directly or sub-allocates them to resellers and downstream carriers, which is why a single 0800 0664 XXX prefix can be used by many different organisations. You can verify any allocation against Ofcom's National Telephone Numbering Plan, which is updated weekly.
Some 0800 0664 XXX calls are silent — your phone rings, you answer, and nobody is there. These are usually 'predictive dialler' calls made by call-centres that dialled more numbers than they have agents available to handle. Ofcom rules require any unanswered abandoned call to play a short identifying message; if it doesn't, you can report the caller to Ofcom.
If a 0800 0664 XXX number called you and you're not sure who it was, the safest steps are: don't return the call until you've verified it (search the full number online first), don't share personal or financial details, and register the number with the Telephone Preference Service (TPS) if it's a marketing call. Persistent unwanted calls can be reported to Ofcom and the ICO. To block a specific number on most UK mobiles and landlines, you can also enable network-level call screening through your provider.
FAQs about 0800 0664 XXX
Is 0800 0664 XXX a real UK phone number?
Yes. 0800 0664 XXX is part of an Ofcom-allocated UK number block — any number starting with that prefix is a real, dialable UK number assigned by Ofcom to Magrathea Telecommunications Limited for use on the UK public telephone network.
Who owns the 0800 0664 XXX number block?
0800 0664 XXX is currently allocated to Magrathea Telecommunications Limited in Ofcom's National Telephone Numbering Plan. The allocated carrier may operate the numbers directly or sub-allocate them to downstream resellers — both arrangements are normal under UK telecoms rules.
Where is a 0800 0664 XXX number based?
0800 0664 XXX is associated with UK Freephone. UK geographic numbers historically indicated the location of the line, although VoIP services and number-portability rules mean a 0800 0664 XXX number can technically be used anywhere a CP routes it. For most UK landlines the geographic match still holds.
How do I block calls from 0800 0664 XXX?
On most UK smartphones, open the recent-calls list, tap the number, and choose 'Block this caller'. UK landlines from BT, Sky, TalkTalk and Virgin Media include free 'BT Call Protect'-style screening you can enable in your provider's app. You can also register your number with the Telephone Preference Service (TPS) at tpsonline.org.uk to opt out of legitimate UK marketing calls.
Other blocks in 0800
Try a different block within the same UK area code:
