Calls from (028) 21520 XXX — Northern Ireland
Block (028) 21520 XXX is allocated by Ofcom to Sky, on the Northern Ireland exchange (allocated 2018).
(028) 21520 XXX is a number block in Northern Ireland, an area with a population of approximately 1,880,000. Standard landlines in this area use the format 028 2152 0123, with the first part being the dialling code and the rest being the local number.
This block — (028) 21520 XXX — was allocated by Ofcom to Sky in 2018. Sky either operates the numbers directly or sub-allocates them to resellers and downstream carriers, which is why a single (028) 21520 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 (028) 21520 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 (028) 21520 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 (028) 21520 XXX
Is (028) 21520 XXX a real UK phone number?
Yes. (028) 21520 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 Sky for use on the UK public telephone network.
Who owns the (028) 21520 XXX number block?
(028) 21520 XXX is currently allocated to Sky 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 (028) 21520 XXX number based?
(028) 21520 XXX is associated with Northern Ireland. UK geographic numbers historically indicated the location of the line, although VoIP services and number-portability rules mean a (028) 21520 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 (028) 21520 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 (028)
Try a different block within the same UK area code:
