Calls from 01753 935 XXX — Slough
Block 01753 935 XXX is allocated by Ofcom to Colt Technology, on the Slough exchange (allocated 2025).
01753 935 XXX is a number block in Slough, in the historic county of Berkshire, an area with a population of approximately 164,793. Standard landlines in this area use the format 01753 935123, with the first part being the dialling code and the rest being the local number.
This block — 01753 935 XXX — was allocated by Ofcom to Colt Technology in 2025. Colt Technology either operates the numbers directly or sub-allocates them to resellers and downstream carriers, which is why a single 01753 935 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.
The HMRC-impersonation scam continues to be the most-reported telephone scam in the UK, and blocks like 01753 935 XXX are sometimes spoofed for these calls. HMRC will never threaten arrest, demand payment by gift card or cryptocurrency, or use a 'press 1 to speak to an officer' menu. If in doubt, hang up and contact HMRC on the number printed on their gov.uk page.
If a 01753 935 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 01753 935 XXX
Is 01753 935 XXX a real UK phone number?
Yes. 01753 935 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 Colt Technology for use on the UK public telephone network.
Who owns the 01753 935 XXX number block?
01753 935 XXX is currently allocated to Colt Technology 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 01753 935 XXX number based?
01753 935 XXX is associated with Slough. UK geographic numbers historically indicated the location of the line, although VoIP services and number-portability rules mean a 01753 935 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 01753 935 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 01753
Try a different block within the same UK area code:
