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Guidance

Assessing coverage before commitment

Coverage maps are forecasts, not warranties. Five steps separate the facts of a postcode from the weather of marketing — applied before any signature.

Published: Northgate Review editorial deskLast reviewed: July 2026Reading time: 4 minutesJurisdiction: United Kingdom

Summary of key points

  1. Consult the physical network's own checker, reading indoor and outdoor forecasts separately.
  2. Cross-examine with Ofcom's independent checker, which grades all four networks by one standard.
  3. For virtual operators, assess the host — the brand's advertising is immaterial.
  4. Nothing supersedes a one-month trial SIM tested in one's actual rooms.

I.The five-step method

The operator's own postcode checker

Full postcode; indoor and outdoor forecasts read as distinct facts. For a virtual brand, the host is consulted — the mapping stands in the sector review.

Ofcom's independent checker

One standard across the four physical networks — the corrective to marketing optimism.

Weight the indoor forecast

Foil-backed insulation and modern glazing consume signal; the rear bedroom is where complaints originate.

Trial with an inexpensive SIM

One month upon the host network — or any brand leasing it — tests the actual rooms, commute and workplace: the only admissible evidence.

Enable Wi-Fi Calling regardless of choice

The permanent no-cost backstop for indoor weak points — signal guide.

II.Reading the results

  • A network is judged by the layer one will inhabit: 4G-only at home renders distant 5G claims irrelevant.
  • "Variable" indoor coverage means precisely that — adequate by the window, poor at the rear. The pessimistic reading applies to the rooms one lives in.
  • Masts are added, upgraded and re-tuned continuously; last year's assessment is history, not evidence.

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