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Range holder

Telefonica UK Limited

Telefonica UK Limited (the O2 network) is listed by Ofcom as the originally-allocated provider for 1,629 UK number ranges, mostly mobile (07). Visitors have checked 5,398 different numbers from its ranges here. Numbers within these blocks may have since been ported to a different carrier.

Telefonica UK Limited at a glance

Consumer brand
O2
Number ranges
1,629
Number types
  • Mobile (07) 1,564
  • Pager (076) 38
  • Service (084/087) 12
  • Personal (070) 10
  • Landline (01/02) 3
  • Freephone (080) 1
  • UK-wide (03) 1
First allocation
16 November 1995
Latest allocation
11 June 2020
Most blocks in
0118 Reading, 01600 Monmouth, 020 London

Source: Ofcom numbering data, re-imported weekly. Each range is counted once.

Allocated ranges by year

The year Ofcom allocated each range Telefonica UK Limited still holds; the busiest year was 2007 (310).

199510
1997120
199820
1999100
200089
200150
200250
200390
2004110
2005208
2006225
2007310
200860
200940
201034
201210
201320
201410
201530
201620
20181
202020

What people check and report about numbers on Telefonica UK Limited ranges

From searches in our lookup form since 13 May 2026 and the verdicts and reports visitors left. A check means someone typed the number in, usually after a missed call.

Checks
5,793
Different numbers checked
5,398
Different people checking
5,291

That makes numbers on Telefonica UK Limited ranges the 2nd most-checked of the 186 range holders people have looked up here.

By day of the week

Busiest: Tuesday (17% of checks)

MoTuWeThFrSaSu

By hour (UK time)

Busiest: 12pm–1pm; the three busiest hours hold 31% of checks

0:006:0012:0018:0023:00

Caller verdicts on numbers on Telefonica UK Limited ranges: 147

Scam 78% (115) · Nuisance 8% (12) · Safe 14% (20)

Community reports: bank impersonation (6), HMRC and tax scams (1), parcel and courier scams (1), 070 and spoofed-number calls (1).

Latest comments

  • “american voice asking about imigration status”

    Scam · 07746 226276 · 6 Oct 2026

  • “tried to sell life insurance”

    Scam · 07706 578755 · 2 Oct 2026

  • “Keeps ringing but does not leave a message. Probable spam”

    Scam · 07542 609409 · 1 Oct 2026

Most-reported and most-checked numbers on Telefonica UK Limited ranges

NumberVerdictsReportsPeople checking
07724 5613792 scam—4
07513 4607141 scam11
07597 6975621 scam11
07808 4223681 scam11
07871 9517291 scam11

If a number from Telefonica UK Limited's ranges called you

Reports here are mostly about bank impersonation and HMRC and tax scams, so treat unexpected calls as possible scams.

  1. 1

    Bank calls: use 159

    Hang up and dial 159 from a phone the caller hasn't just used. It connects you to most UK banks' real fraud lines. Your bank will never ask you to move money to a 'safe account'.

    159 (Stop Scams UK) ↗

  2. 2

    Call back on a number you trust

    If a caller says they're your bank, HMRC, a courier or a council, hang up and ring the organisation on the number from its website or your statement, never the number that called you. Caller ID can be faked.

  3. 3

    Forward it to 7726

    On a mobile, copy the caller's number from your recent calls and text it to 7726 (it spells SPAM). Scam texts can be forwarded to 7726 as they are. It's free, and your network uses the reports to investigate and block numbers.

    Ofcom: what to do about a scam call ↗

  4. 4

    If you lost money or shared details

    Call your bank on the number on your card (or 159 to reach most UK banks safely), then report it to Report Fraud online or on 0300 123 2040. Report Fraud replaced Action Fraud on 4 December 2025 for England, Wales and Northern Ireland; in Scotland call Police Scotland on 101.

    159 (Stop Scams UK) ↗Report Fraud ↗

All Telefonica UK Limited rangesfirst 1,000 of 1,629, by prefix
PrefixStatus
+44 118402Allocated
+44 16002Allocated
+44 203505Allocated
+44 345023Allocated
+44 70600Allocated
+44 70601Allocated
+44 70602Allocated
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Related lookups

Frequently asked questions

What does it mean that Telefonica UK Limited is the range holder?

Ofcom allocated the blocks listed on this page to Telefonica UK Limited, which trades as O2. A number keeps its digits when its user switches provider, so a number in these blocks may now be on another network; Ofcom doesn't publish who a number is on today.

What kinds of numbers does Telefonica UK Limited hold?

Of its 1,629 allocated ranges: 1,564 mobile (07), 38 pager (076), 12 service (084/087), 10 personal (070), 3 landline (01/02), 1 freephone (080), 1 uk-wide (03). The oldest dates from 16 November 1995 and the newest from 11 June 2020.

Which area codes does Telefonica UK Limited have most numbers in?

By allocated blocks: 0118 Reading (1), 01600 Monmouth (1), 020 London (1).

Are numbers from Telefonica UK Limited's ranges reported as scams?

Visitors have checked 5,398 different numbers from these ranges here since May 2026. 147 verdicts have been left on them: 115 scam, 12 nuisance, 20 safe. A scam verdict is about the caller using the number, not Telefonica UK Limited.

How often is the Telefonica UK Limited list updated?

Ofcom publishes its numbering data every Wednesday and this page is rebuilt from it weekly, so new Telefonica UK Limited blocks appear within about a week.