Marathon Telecom Limited in Cardiff

About Marathon Telecom Limited’s Cardiff allocation

When Marathon Telecom Limited is the range holder for +44 29 it means Ofcom recorded Marathon Telecom Limited as the provider entitled to issue numbers from these blocks when they were first allocated under the UK National Telephone Numbering Plan. 2 Cardiff-facing blocks sit against Marathon Telecom Limited in the current Ofcom snapshot, each of which can carry up to ten thousand individual digits available for assignment to end customers.

Cardiff’s South Wales telecoms estate is shaped by Cardiff's catchment of roughly 480,000 residents: a dense urban exchange typically hosts allocations from several national operators in parallel, which is why you see Marathon Telecom Limited’s blocks alongside other range holders on the same 029 code. Local switching capacity, historic Openreach exchange footprints, and Marathon Telecom Limited’s wholesale routing arrangements all influence which blocks land in Cardiff rather than elsewhere on the national plan.

Treat this allocation as a starting point, not a verdict on any specific caller. UK numbers are portable, so the current carrier on a given 029 digit string may differ from the range holder shown — read Range Holder vs current provider for the distinction, and How Ofcom allocates UK phone numbers for the wider context behind the table below.