020 Area Code London

The 020 area code is designated explicitly for London and the surrounding area in London, United Kingdom.

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When is it necessary to use the 020 London dialling code?

If you're calling from outside the 020 London area code, you'll need to use the dialling code. If you're using a landline or mobile phone within the same area code, you don't need to use the 020 code. When calling from outside the UK, you'll need to include the international dialling code for your country, followed by the UK code (44) and the area code without the first zero (20).