Calls from 01536 857 XXX — Kettering
Block 01536 857 XXX is allocated by Ofcom to Twilio Ireland Limited, on the Kettering exchange (allocated 2021).
01536 857 XXX is a number block in Kettering, in the historic county of Northamptonshire, an area with a population of approximately 63,675. Standard landlines in this area use the format 01536 857123, with the first part being the dialling code and the rest being the local number.
This block — 01536 857 XXX — was allocated by Ofcom to Twilio Ireland Limited in 2021. Twilio Ireland Limited either operates the numbers directly or sub-allocates them to resellers and downstream carriers, which is why a single 01536 857 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.
Recent Citizens Advice data shows a rising number of complaints about debt-management cold calls from blocks like 01536 857 XXX. These calls typically promise to write off existing debts for a fee and can lead to unregulated 'debt-advice' services. The free, regulated alternatives are StepChange and Citizens Advice — both refuse to cold-call.
If a 01536 857 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 01536 857 XXX
Is 01536 857 XXX a real UK phone number?
Yes. 01536 857 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 Twilio Ireland Limited for use on the UK public telephone network.
Who owns the 01536 857 XXX number block?
01536 857 XXX is currently allocated to Twilio Ireland 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 01536 857 XXX number based?
01536 857 XXX is associated with Kettering. UK geographic numbers historically indicated the location of the line, although VoIP services and number-portability rules mean a 01536 857 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 01536 857 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 01536
Try a different block within the same UK area code:
