Who called me from 07983 700 720?

079 837 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 0798371234 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 — 079 837 XXXXX — was allocated by Ofcom to EE in 2006. EE either operates the numbers directly or sub-allocates them to resellers and downstream carriers, which is why a single 079 837 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.

One important caveat applies to every UK number, including this one: caller-ID spoofing means the number you see is not guaranteed to be the line actually calling. If a call from 07983 700 720 claims to be your bank, HMRC or a delivery company and asks you to act urgently, hang up and contact the organisation directly using a number you've verified yourself — for banks you can simply dial 159.

• Don't act on the call alone. If the caller claimed to be your bank, HMRC, a courier or a utility, hang up and contact the organisation on a number you find yourself — never one the caller gives you. For banks, dial 159.
• Never share security details. Full passwords, PINs and one-time passcodes are never requested by legitimate UK organisations on an outbound call.
• Don't return a missed call you don't recognise. One-ring 'wangiri' scams rely on call-backs, sometimes routed to premium-rate lines.
• Report what happened. Use the report form above to warn other UK users, and report fraud attempts to Action Fraud (or 101 in Scotland).
• If money or details were given, contact your bank immediately on 159 and report to Action Fraud.

Block 07983 700 720 on your phone

On iPhone: open Phone → Recents, tap the ⓘ next to 07983 700 720 and choose Block this Caller. On Android: open Phone → Recents, tap the number and choose Block/report spam. Landline customers of BT, Sky, TalkTalk and Virgin Media can enable free network-level call screening in their provider's app, which stops the call before the phone ever rings.

Report 07983 700 720 to the authorities

Report scam calls to Action Fraud (England, Wales & NI) or call 101 in Scotland. Persistent nuisance or silent calls go to Ofcom, and unlawful marketing calls to the ICO. Scam texts can be forwarded free to 7726. Registering with the Telephone Preference Service (tpsonline.org.uk) cuts legitimate UK marketing calls.

Recent Citizens Advice data shows a rising number of complaints about debt-management cold calls from blocks like 079 837 XXXXX. These calls typically promise to write off existing debts for a fee and can lead to unregulated 'debt-advice' services. The free, regulated alternatives are StepChange and Citizens Advice — both refuse to cold-call.

See the full picture for this range on the 079 837 XXXXX block page or the 079 (UK Mobile) area code page.