Calls from 077 197 XXXXX — UK mobile
Block 077 197 XXXXX is allocated by Ofcom to Telefonica UK Limited (allocated 1999).
077 197 XXXXX is a UK mobile number block. UK mobiles use prefixes 071–075 and 077–079, with 076 reserved for radiopagers and 070 for personal-numbering services. A number such as 0771971234 could be active on any of the four UK mobile networks — EE, O2, Vodafone or Three — or any of the dozens of MVNOs (mobile virtual network operators) that lease capacity from them, including Tesco Mobile, Sky Mobile, giffgaff, Smarty, Lebara and Voxi.
This block — 077 197 XXXXX — was allocated by Ofcom to Telefonica UK Limited in 1999. Telefonica UK Limited either operates the numbers directly or sub-allocates them to resellers and downstream carriers, which is why a single 077 197 XXXXX 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 077 197 XXXXX 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 077 197 XXXXX 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 077 197 XXXXX
Is 077 197 XXXXX a real UK phone number?
Yes. 077 197 XXXXX 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 Telefonica UK Limited for use on the UK public telephone network.
Who owns the 077 197 XXXXX number block?
077 197 XXXXX is currently allocated to Telefonica UK 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.
Can I tell which network a 077 197 XXXXX mobile number is on?
Not from the prefix alone. UK mobile numbers have been portable between networks since 1999, so even though 077 197 XXXXX was originally allocated to Telefonica UK Limited, the individual subscriber's number could have been moved to any other UK network. Live network-lookup tools query the central UK porting database to find the current network.
How do I block calls from 077 197 XXXXX?
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 077
Try a different block within the same UK area code:
