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0203 London area code

Who Called Me From a 0203 Number? London Capacity Overlay

A 0203 number is a London geographic landline. Ofcom opened the 0203 range in 2005 as the original 0207 / 0208 London ranges began to fill up. Functionally a 0203 number is identical to a 0207 / 0208 / 0204 number — same London 020 area code, same call cost.

Risk: Low — 0203 is part of the London 020 area code — a legitimate geographic landline range, charged at standard local rate.

0203 London area code · Live Ofcom dataUK Phone Number Checker

Type the full UK number that starts with 0203 to see the original Ofcom range holder, the number type, call cost and risk flag — instantly, with no signup.

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Number type

London Geographic (020)

Number format

0203 ___ ____ (an 11-digit number)

Call cost

Standard 01/02 rate (inc. in minutes)

Risk level

Low

Had a call from a 0203 number? Add your one-click rating

1 visitor has rated calls from 0203 numbers so far — mostly legitimate callers.

Dialling-area guide

0203 numbers sit inside the 020 (London) dialling area. See the full 020 area-code guide for the map, number ranges, operators serving London, local scam patterns and neighbouring codes.

Recently reported 0203 numbers

The newest first-hand caller reports for numbers in the 0203 range, submitted by visitors — click any number for its full report.

020 3504 6037 “Calls, let you pick up and cut call. You call back and it just keeps repeating welcome, pr…” · 11 Jul 020 3996 3770 “Text purporting to be from my bank about a transaction on hold and to phone if not my tran…” · 11 Jul 020 3518 8935 “The call was Not in service” · 9 Jul 020 3561 2275 “Silent , answered and said hello and noone answered after a few seconds they hang up” · 9 Jul 020 3724 5698 “Called but not on my contact list so wasn't answered. No message left. Tried to call back…” · 9 Jul

Got the full 11-digit number?

Use our free UK Phone Number Checker tool to look up any UK number — mobile, landline, freephone or premium — against live Ofcom range-holder data. No signup, results in milliseconds.

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Frequently asked questions about 0203 numbers

What is the 0203 area code?

0203 is a London area code overlay opened by Ofcom in 2005 to provide additional capacity within the 020 London family. It is geographically a London number and shares the same call-cost rules as 0207 and 0208.

Who called me from a 0203 number?

A 0203 caller is using a London landline. Type the full 11-digit 0203 number into the free checker on this page to see which UK provider Ofcom originally allocated the block to.

Is 0203 a scam?

0203 is a real London geographic range. Like any other London number, 0203 is occasionally used by telemarketers and (rarely) scam callers. Treat unsolicited 0203 calls asking for bank or login details as suspicious regardless of the prefix.

How much does it cost to call 0203?

Calling 0203 from a UK landline or mobile costs the standard geographic rate, included in inclusive minutes on every modern plan.

Most searched 0203 numbers

The 0203 numbers visitors have checked most on our free lookup — click any number for its full report, range holder and community comments.

020 3322 2305 130 lookups 020 3743 6966 72 lookups 020 3006 7496 71 lookups 020 3769 2685 67 lookups 020 3196 1439 63 lookups 020 3518 8936 50 lookups 020 3911 9530 47 lookups 020 3875 2836 40 lookups

Trending lookups right now

The UK numbers most checked on this site in the last 24 hours.

020 4578 874635 checks today07368 95****33 checks today07341 66****31 checks today07342 37****25 checks today07359 73****25 checks today07359 74****24 checks today07361 23****23 checks today0331 630 487822 checks today

Latest community reports

The newest first-hand caller reports submitted by visitors.

07909 10****spam“Claimed to be Santander and asked about for approval for transaction - I don’t have a Santander account”11 Jul, 20:4907359 40****spam“Automated 'Goodbye' as soon as I picked up.”11 Jul, 19:1007746 65****silent“Answered said hello nobody answered so hang up”11 Jul, 19:030151 458 6554spam“Called about my Three sim upgrade, which i'm not doing.”11 Jul, 18:470345 900 6010scam“Claimed to be barclays!!!”11 Jul, 18:07

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Other UK prefixes you might be looking up

0204 London Geographic (020) 0207 London Geographic (020) 0208 London Geographic (020) 07441 UK Mobile (07XX) 07700 UK Mobile (07XX) 07379 UK Mobile (07XX) 07477 UK Mobile (07XX) 07359 UK Mobile (07XX)

Or see the full UK number prefix directory →

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