0203 Area Code
The dialling code for London: what 0203 numbers are, who holds them, and what to do about a call you don't recognise.
What Is the 0203 Area Code?
London landline number. 0203 is the dialling code for London. Numbers starting 0203 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in London.
Who was the range allocated to?
We don't have Ofcom allocation details for 0203.
Numbers can be moved (ported) between networks, so the network a caller uses today may not be the one Ofcom allocated the block to. The allocation does not identify the person or business using a number.
Had a call from a 0203 number you don't recognise?
We can't tell you who called: an area code only shows the type of number and the provider Ofcom allocated the range to.
- Don't call back in a hurry, even if a message says it's urgent. Never give bank details or security codes on a call you didn't expect.
- Block the number from your phone's recent calls list.
- Forward scam texts free to 7726. Report unwanted marketing calls to the ICO, and see Ofcom's advice on scam calls.
- Register your number with the Telephone Preference Service to opt out of sales calls.
About the 0203 Range
| Number type | London landline number |
|---|---|
| Area | London |
| Number format | 0203 XXX XXXX |
Ofcom's allocation data isn't available for this code, so these facts come from the UK numbering plan's prefix rules.
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Common Questions About 0203 Numbers
Where is the 0203 area code?
0203 is the dialling code for London. Numbers starting 0203 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in London.
Is 0203 a mobile number?
No. 0203 is a landline (geographic) area code for London. UK mobile numbers start with 07.
Who does the 0203 range belong to?
We don't have Ofcom allocation details for 0203. Ofcom allocates UK numbers to providers in blocks, and numbers can be moved (ported) between networks, so the network a caller uses today may not be the one Ofcom allocated the block to. The allocation does not identify the person or business using a number.
Who called me from a 0203 number?
We can't tell you who called. An area code only shows the type of number and which provider Ofcom allocated the range to. If you don't recognise a 0203 number, don't call back in a hurry, and never give out bank details or security codes on a call you didn't expect.
Block the number from your phone's recent calls list. Forward scam texts free to 7726, report unwanted marketing calls to the ICO, and see Ofcom's advice on scam calls.