Who called me from a Telefonica UK Limited number?
Telefonica UK Limited is a UK communications provider. Look up any of its 1,627 Ofcom-allocated number blocks below.
Telefonica UK Limited is a UK communications provider. That means Ofcom has allocated Telefonica UK Limited one or more blocks of UK telephone numbers under the National Telephone Numbering Plan, which Telefonica UK Limited can either use for its own customers or sub-allocate to resellers and downstream providers. In total, Telefonica UK Limited currently holds 1,627 allocated number blocks in our copy of the Ofcom plan.
Telefonica UK Limited's number ranges are concentrated in 077, 075, 078, 079. Across all of its allocations the split is roughly 1,602 mobile, 12 premium-rate, 10 personal, 1 03 non-geographic, 1 freephone, 1 geographic landline blocks. You can use the tables below to jump straight to a specific Telefonica UK Limited area code or number block and see the common call patterns reported for it.
The oldest Telefonica UK Limited number block in the Ofcom data was allocated in 1995, and the most recent in 2020. Allocation dates matter because a number that has been live for many years is more likely to be a settled business or residential line, whereas a very recently-allocated block is more commonly seen in VoIP and virtual-number services — the kind sometimes used for short-lived marketing or scam campaigns.
Is a Telefonica UK Limited number safe to answer? In most cases, yes — the overwhelming majority of calls from any UK provider's range are ordinary, legitimate calls. However, two things are important to understand. First, because Telefonica UK Limited can sub-allocate or resell its numbers, the fact that a number sits in a Telefonica UK Limited block does not mean Telefonica UK Limited itself is calling you. Second, UK caller IDs can be spoofed: scammers can make a call appear to come from a Telefonica UK Limited number they don't control. So treat the number as a clue, not proof — judge the call on what the caller actually asks for.
If a Telefonica UK Limited number called you and you're unsure, don't share security details, bank information or one-time passcodes, and don't return the call until you've verified it independently. You can block the specific number on any UK smartphone from the recent-calls list, enable free network-level call screening through your own landline provider, and register with the Telephone Preference Service (TPS) to cut legitimate marketing calls. Persistent nuisance calls can be reported to Ofcom, and suspected scams to Action Fraud (or Police Scotland on 101).
Where Telefonica UK Limited numbers are based
The area codes where Telefonica UK Limited holds the most Ofcom-allocated number blocks. Click an area to see every block and the call patterns reported there.
| Area code | Location | Type | Blocks |
|---|---|---|---|
| 077 | UK Mobile | Mobile | 489 |
| 075 | UK Mobile | Mobile | 450 |
| 078 | UK Mobile | Mobile | 325 |
| 079 | UK Mobile | Mobile | 170 |
| 073 | UK Mobile | Mobile | 60 |
| 074 | UK Mobile | Mobile | 50 |
| 076 | UK Pager | Mobile | 38 |
| 071 | UK Mobile | Mobile | 20 |
| 070 | UK Personal Numbers | Personal | 10 |
| 0843 | UK Service rate | Premium | 5 |
| 0872 | UK Service rate | Premium | 5 |
| (020) | London | Geographic | 1 |
| 0345 | UK Non-geographic | Nongeographic | 1 |
| 0800 | UK Freephone | Freephone | 1 |
| 0845 | UK Service rate | Premium | 1 |
Example Telefonica UK Limited number blocks
A sample of individual number blocks allocated to Telefonica UK Limited. Each links to a full guide for that block:
FAQs about Telefonica UK Limited numbers
Is a Telefonica UK Limited number safe to answer?
A Telefonica UK Limited number is usually a normal, legitimate UK line — Telefonica UK Limited is an Ofcom-licensed communications provider. But because numbers can be resold and caller IDs can be spoofed, you should still judge each call on its content: hang up on anyone who pressures you, asks for security details or one-time passcodes, or wants remote access to your device.
Does a Telefonica UK Limited number mean Telefonica UK Limited is calling me?
Not necessarily. Telefonica UK Limited allocates numbers to its own customers and often sub-allocates ranges to resellers and downstream providers, so the organisation actually calling you may be a completely different business using a Telefonica UK Limited-allocated number. Number spoofing can also make an unrelated caller appear to use a Telefonica UK Limited number.
How many UK numbers does Telefonica UK Limited have?
Telefonica UK Limited currently holds 1,627 Ofcom-allocated number blocks in our copy of the National Telephone Numbering Plan. Each block typically covers 1,000 or 10,000 individual numbers, so the real count of usable numbers is far higher.
How do I block and report a Telefonica UK Limited number?
On most UK smartphones, open your recent calls, tap the number and choose 'Block this caller'. UK landline providers (BT, Sky, TalkTalk, Virgin Media) offer free call screening you can switch on in their app. Report nuisance calls to Ofcom, scam calls to Action Fraud, and forward scam texts free to 7726. You can also register with the TPS at tpsonline.org.uk to stop legitimate marketing calls.
