Mobile
07523 Mobile numbers UK
07523 is a UK mobile range. In the latest Ofcom data the 07523 blocks are allocated to Telefonica UK Limited. Calls and texts to 07523 numbers are charged at your standard mobile rate.
All one million 07523 numbers are allocated, the first in 2007. Visitors have checked 77 different 07523 numbers here.
07523 at a glance
- Number type
- UK mobile, standard rate (not premium, not a landline)
- Numbers allocated
- 1,000,000 of 1,000,000 (100%)
- Providers
- O2 (Telefonica UK Limited) 1,000,000 numbers since 2007
- Big four networks
- 100% of allocated numbers (O2)
- First issued
- 15 May 2007
- Newest range
- 15 May 2007
- Location
- None: UK mobile numbers aren't tied to a place
Source: Ofcom numbering data, re-imported weekly.
What it costs to call an 07523 number
Standard mobile rate, usually inside call bundles.
- From a mobile
- Normally in inclusive minutes; 3p to 65p a minute outside them
- From a landline
- Often included; otherwise typically 10p to 20p a minute plus a set-up fee (usually 23p)
Source: Ofcom call costs guide (updated 31 January 2025). Ofcom treats these as indicative; your provider sets the final price.
What people check and report about 07523 numbers
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
- 83
- Different numbers checked
- 77
- Different people checking
- 78
That makes 07523 numbers the 189th most-checked of the 592 mobile blocks people have looked up here.
Caller verdicts on 07523 numbers: 1
1 safe. Too few to show shares yet.
Most-reported and most-checked 07523 numbers
| Number | Verdicts | Reports | People checking |
|---|---|---|---|
| 07523 729834 | 1 safe | — | 1 |
If a 07523 number called you
No clear pattern in reports for these numbers yet. If a call worried you:
- 1
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.
- 2
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.
- 3
Stop sales calls
Register your landline and mobile free with the Telephone Preference Service (0345 070 0707). Legitimate UK marketers must check it; calls should drop within 28 days. It won't stop scammers.
- 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.
Who owns a 07523 number?
07523 is not an area code: it is a slice of the national 07 mobile range that Ofcom hands to providers in blocks. The largest holder of 07523 numbers is O2 (Telefonica UK Limited). A number can be ported to another network while keeping its digits, so the holder is the original provider rather than necessarily today’s. The person behind a number isn’t public: no legitimate free service can name a stranger from their mobile number. See UK mobile networks by prefix for how blocks are shared out.
Ranges starting with 0752310 on Ofcom's register
| Prefix | Status | Range holder | Allocated |
|---|---|---|---|
| +44 75230 | Allocated | Telefonica UK Limited | 15 May 2007 |
| +44 75231 | Allocated | Telefonica UK Limited | 15 May 2007 |
| +44 75232 | Allocated | Telefonica UK Limited | 15 May 2007 |
| +44 75233 | Allocated | Telefonica UK Limited | 15 May 2007 |
| +44 75234 | Allocated | Telefonica UK Limited | 15 May 2007 |
| +44 75235 | Allocated | Telefonica UK Limited | 15 May 2007 |
| +44 75236 | Allocated | Telefonica UK Limited | 15 May 2007 |
| +44 75237 | Allocated | Telefonica UK Limited | 15 May 2007 |
| +44 75238 | Allocated | Telefonica UK Limited | 15 May 2007 |
| +44 75239 | Allocated | Telefonica UK Limited | 15 May 2007 |
Related lookups
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- 07520 numbersNearby UK mobile block
- 07521 numbersNearby UK mobile block
- 07522 numbersNearby UK mobile block
- 07525 numbersNearby UK mobile block
- 07526 numbersNearby UK mobile block
- 07511 numbersAlso mostly O2, 10 ranges
- 07512 numbersAlso mostly O2, 10 ranges
- 07513 numbersAlso mostly O2, 10 ranges
- 07514 numbersAlso mostly O2, 10 ranges
- 07515 numbersAlso mostly O2, 10 ranges
- 07516 numbersAlso mostly O2, 10 ranges
- 07517 numbersAlso mostly O2, 10 ranges
- 07518 numbersAlso mostly O2, 10 ranges
- 07 MobileAll UK mobile blocks
- 0800 Freephone
- 0808 Freephone
- 0345 UK-rate
- 0333 UK-rate
- 0843 Service rate
- How 0800 freephone numbers work in the UKCornerstone guide
- 0808 numbers UK — what they costCornerstone guide
- 0345 numbers explainedCornerstone guide
- 0345 vs 0800: which is cheaper to call?Cornerstone guide
FAQs about 07523
Which network are 07523 numbers on?
Ofcom has allocated 1,000,000 of the million 07523 numbers (100%) to 1 provider: O2 (Telefonica UK Limited) (1,000,000). The four big networks hold 100% of the allocated numbers. A number can be ported, so its current network may differ.
When were 07523 numbers first issued?
The oldest allocation still on Ofcom's register for 07523 dates from 15 May 2007.
Can I find out who owns a 07523 number?
Ofcom's register names the provider behind each 07523 range, not the person using a number, and UK mobile numbers aren't in any public directory. Enter the full number above to see its range holder and any verdicts or reports about that exact number.
Are 07523 numbers scams?
Visitors have checked 77 different 07523 numbers here 83 times since May 2026. They left 1 verdict: 0 scam, 0 nuisance, 1 safe.
What does it cost to call a 07523 number?
It's a standard UK mobile number: calls are normally in inclusive minutes, and Ofcom's call costs guide puts calls outside a bundle at 3p to 65p a minute from a mobile and typically 10p to 20p a minute from a landline.
How do I report a 07523 number?
Copy the number from your recent calls and text it to 7726 (free); forward scam texts to 7726 too. If you lost money, call your bank and report it to Report Fraud on 0300 123 2040 (Police Scotland on 101 in Scotland). Register with the Telephone Preference Service to cut sales calls.