0203 numbers: part of London's 020 code
0203 numbers belong to London's 020 code and are written 020 3xxx xxxx. From outside the UK: +44 20 3xxx xxxx.
Why 0203 isn't an area code
Numbers beginning 0203 are London landlines. The real area code is 020; the 3 is the first digit of an eight-digit local number, so the proper format is 020 3xxx xxxx.
London was running short of numbers in 2005, so the 3 block was opened up. It has never belonged to a particular part of the city, and internet phone providers across the UK give out 0203 numbers to customers wherever they are. A 0203 caller could be in Leeds, Lagos or Leicester Square.
All of London's blocks are listed on the 020 area code page.
0203 key facts
- Number block
- 0203
- Belongs to
- 020, London
- Written as
- 020 3xxx xxxx
- From abroad
- +44 20 3xxx xxxx
- Kind of number
- Landline (geographic)
- Cost to call
- Standard landline rate
- Numbers we hold
- 2,235
0203 numbers people have checked
Questions about 0203 numbers
Is 0203 a separate area code?
No. London's area code is 020, and the 3 is just the first digit of the eight-digit local number. Written properly it's 020 3xxx xxxx.
Is a 0203 caller definitely in London?
London was running short of numbers in 2005, so the 3 block was opened up. It has never belonged to a particular part of the city, and internet phone providers across the UK give out 0203 numbers to customers wherever they are. A 0203 caller could be in Leeds, Lagos or Leicester Square.
How do I call a 0203 number from abroad?
Dial +44 or 00 44, then 20 (leaving off the 0), then the eight local digits: +44 20 3xxx xxxx.
What does it cost to ring a 0203 number?
The same as any UK landline call. Most landline and mobile plans include these calls in their minutes.
Who called me from a 0203 number?
A London number looks trustworthy, which is why it's popular with scammers who fake their caller ID. Search the full number here and read what other people reported before you return the call.