WhoIsCalling.me.uk

Who called from 020 3937 8730

A landline number from the 020 area code (London).

How to block it

Did this number call you? What was it?

No one has reported this number yet. Reports appear here once 3 people have told us about it.

One report per number from each visitor. If you choose again, your new answer replaces the old one. By sending a report you agree to the terms of use. How reports work.

Who lists this number

We only show numbers an organisation publishes on its own website, with a quote from that page and the date we checked it.

Tandem Bank

This number is listed by Tandem Bank on its own website (Block your savings account if your details are compromised).

Hours:
Any time

Source: “please call our dedicated support line at any time on 020 3937 8730” (opens in a new tab). Checked 14 October 2026.

Every number Tandem Bank publishes

This could still be a scam call

Criminals can make their number look like a genuine one (this is called spoofing). If someone calls from this number and asks for money, bank details, a code or passwords, hang up. Then call Tandem Bank back on the number on the back of your card, or call 159, which connects you to your bank.

Safe ways to check

What Ofcom’s records say

Number type
Landline (geographic) number
Area or region
London
Area code 020
Cost to call
Standard landline rate
Charged as a standard call to a landline. Usually included in call allowances.
Allocated to
Gamma Telecom Holdings Limited
This is the provider Ofcom allocated the number block to. It is not the caller, and the number may have moved network since.
Ofcom status
Allocated
Block 020 3937 xxxx
Allocated on
29 March 2017
Date Ofcom allocated the block

Source: Ofcom numbering data, files published 7 October 2026, checked 13 October 2026

See the 020 3937 xxxx range for the Ofcom facts about the whole block and any numbers in it that organisations or visitors have told us about.

What the provider and number type mean

Numbers starting 01 and 02 are geographic numbers. The first digits are the area code, which is linked to a place in the UK. Ofcom allows some numbers to be used outside their area, so the person or business may be somewhere else. 020 is the area code for London.

Ofcom allocates phone numbers to communications providers in blocks. The provider shown is the one Ofcom allocated this block to. It is not the person or business that called you, and the number may since have moved to a different network, because people can usually keep their number when they switch provider. Ofcom does not hold information about individual numbers.

Calls to 01 and 02 numbers are usually included in landline and mobile call allowances. Outside an allowance, the price depends on your provider and tariff, so check with your provider.

Report or block 020 3937 8730

Reporting helps networks and the police find the people behind scam calls. Blocking stops this one number, though scammers often switch numbers.

Report it

Block it

Your mobile network’s own help pages

Landline? See how to block calls on a landline.

Every link above goes to the organisation’s own page and was checked on 13 October 2026. More detail: report and block guide.

Is this your number? You can ask us to clear the visitor reports about it.

Sources and checks

This page relies on:

Checked on 13 October 2026. Read how reports work. How we check our information. Spotted a mistake? Tell us and we will put it right.