Who called from +44 20 3123 4567?

+44 20 3123 4567 sits inside the UK 020 dialling code, which Ofcom assigns to London in Greater London. The catchment around London covers a population of approximately 8,982,000. When this number originates a call from a UK landline, the calling exchange is most likely physically located in or near London; portability rules mean the underlying customer can have moved to a different network while keeping the same digits.

+44 20 3123 4567 is classified as a Geographic (01 / 02) number under the UK National Telephone Numbering Plan. Standard UK landline. The Range Holder is the originally allocated provider for the dialling-code block. You can read more about how the UK numbering plan is structured in our explainer How Ofcom allocates UK phone numbers.

Ofcom records list +44 20 3123 4567 as falling inside the +44 203123 range, which was originally allocated to Vodafone Ltd (C&W) with status “Allocated” — the block is currently in active service with a communications provider. The Range Holder is the wholesale carrier that Ofcom assigned the block to — see the difference between a Range Holder and the live carrier in Range Holder vs current provider. In practice this means the digits +44 20 3123 4567 were first handed to Vodafone Ltd (C&W) under the National Telephone Numbering Plan, and Vodafone Ltd (C&W) (or one of their wholesale customers) issued the number to an end-user. Any subsequent port to a different network would not update this allocation record — Ofcom does not publish a live current-carrier feed, so the Range Holder is the strongest free public signal for the originating wholesale identity but not always the live carrier today. The block prefix +44 203123 covers a contiguous range of UK numbers issued under the same allocation; the size of that block depends on whether Ofcom released it as a 1,000-number, 10,000-number, or 100,000-number sub-range.

The block is currently flagged “Allocated” in the Ofcom data, meaning the block is currently in active service with a communications provider.

UK numbers are portable: consumers and businesses can switch network while keeping the same digits. While the table above shows the originally-allocated provider, the number itself may have moved to a different communications provider since allocation and the geographic area code can stay attached to the number even after a customer ports. Ofcom does not publish live carrier data, so the Range Holder cannot confirm who operates +44 20 3123 4567 today — but the community verdicts on this page describe who has actually been calling from it, which is usually the more useful answer.

Looking for context on a different number? Use the UK reverse phone lookup on the homepage, or browse every UK area code and every Ofcom range holder.