Who called from +44 20 3987 6543?

+44 20 3987 6543 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 3987 6543 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 3987 6543 as falling inside the +44 203987 range, which was originally allocated to Gamma Telecom Holdings Limited 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 3987 6543 were first handed to Gamma Telecom Holdings Limited under the National Telephone Numbering Plan, and Gamma Telecom Holdings Limited (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 203987 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 3987 6543 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.