TL;DR
- The primary tool for checking and reporting UK mobile coverage gaps is the Ofcom Mobile & Broadband Checker at checker.ofcom.org.uk.
- A strong not-spot report includes a precise postcode or grid reference, the network(s) affected, whether voice or data is unavailable, and the time and frequency of the issue.
- Ofcom feeds received data into its annual Connected Nations analysis, which underpins regulatory decisions on coverage obligations.
- Formal complaints to operators are the parallel route; unresolved complaints can be escalated to Ofcom or an approved ADR scheme after eight weeks.
- A partial not spot is a location served by at least one but not all four major operators; a total not spot has no coverage from any operator.
The Ofcom Coverage Checker Tool
Ofcom's Mobile & Broadband Checker, accessible at checker.ofcom.org.uk, is the regulator's publicly available tool for comparing predicted coverage from EE, O2, Three, and Vodafone at any UK postcode or address. The tool displays coverage predictions by service type — outdoor voice, outdoor 4G data, indoor voice, and indoor 4G data — for each operator. Users who find that their lived experience diverges from the tool's predictions can submit feedback directly within the interface.
The checker draws on propagation modelling submitted by operators to Ofcom under its Connected Nations data-collection programme. Ofcom uses a standardised 100-metre-square grid and applies consistent signal-strength thresholds across all operators to produce comparable coverage maps. Because these maps are model outputs rather than live measurements, they can differ from on-the-ground reality, which is precisely why Ofcom values crowdsourced feedback to calibrate its data.
What Data to Provide in a Not-Spot Report
A useful coverage report contains enough geographic and technical detail for Ofcom to cross-reference against its propagation models. At minimum, include the full postcode of the affected location, the network or networks on which coverage is absent, and whether the issue relates to voice calls, mobile data, or both. If coverage is intermittent rather than entirely absent, note the times and conditions under which it fails — for example, whether it is consistently absent or only fails when indoors.
Supporting information significantly strengthens a report. Screenshots from the Ofcom checker showing predicted versus actual coverage, notes on the local terrain (valley, hilltop, dense woodland), and a description of how the issue affects practical activities such as emergency calls or remote working all provide context that Ofcom and DSIT can use when engaging with operators over coverage obligations. Community-level submissions from local councils or community groups, aggregating multiple individual reports with a common grid reference, carry particular weight in the SRN governance process.
| Step | Action | Where | Outcome |
|---|---|---|---|
| 1. Check predicted coverage | Enter postcode in Ofcom checker | checker.ofcom.org.uk | Confirms whether Ofcom model predicts coverage |
| 2. Submit checker feedback | Use “Tell us about your experience” within tool | checker.ofcom.org.uk | Data feeds into Connected Nations calibration |
| 3. Complain to operator | Submit formal coverage complaint | Operator website or phone | Operator must respond within 8 weeks |
| 4. Escalate if unresolved | Refer to Ofcom or ADR scheme | ofcom.org.uk or Ombudsman Services | Formal investigation possible |
| 5. Community submission | Council or MP submits aggregated evidence to DSIT | Via DSIT SRN governance process | Can trigger SRN deployment obligation review |
What Happens After You Report
Ofcom incorporates consumer feedback into its Connected Nations data collection, which forms the evidential basis for its annual Connected Nations reports. These reports are not merely descriptive: they inform Ofcom's decisions about whether operators are meeting the coverage obligations attached to their spectrum licences and whether enforcement action is warranted. Where Ofcom identifies a systemic gap between predicted and actual coverage, it can require operators to improve the accuracy of their submitted propagation models.
It is important to be realistic about the timeframe. An individual report does not automatically trigger a mast deployment or a site visit from an operator. The pathway from report to physical infrastructure improvement runs through the regulatory cycle and the SRN governance process, both of which operate over months and years rather than days. However, aggregated evidence from a community or a recurring pattern of reports from the same location can materially shift Ofcom's assessment of whether an area qualifies for SRN intervention.
How Reports Feed Into Coverage Obligation Monitoring
Ofcom monitors operator compliance with coverage licence conditions through a combination of operator self-reporting and its own modelling. Consumer feedback is a third source that provides a reality check on operator-submitted data. Where the checker feedback data shows sustained divergence from the operator's own model predictions in a particular area, Ofcom can initiate a more detailed review of that operator's coverage claims. This process is part of the accountability mechanism that underpins spectrum licensing in the UK.
The Wireless Telegraphy Act 2006 and the Communications Act 2003 provide Ofcom with enforcement powers against operators that fail to meet licence conditions, including coverage conditions. While enforcement proceedings are relatively rare for individual coverage gaps, the connected data picture built up from thousands of individual reports shapes the overall regulatory posture toward each operator.
Partial vs Total Not Spots: Why the Distinction Matters for Reporting
When submitting a report, it is useful to understand whether you are describing a partial or a total not spot. A partial not spot — where some operators have coverage but yours does not — is primarily a matter for your specific operator's complaint and SRN obligation process. If the checker shows that other operators cover the location, your operator may be required under the SRN to extend its own network there. A total not spot — where no operator has coverage — falls under both the government-funded and industry-funded components of the SRN and is more likely to trigger a shared mast deployment.
Identifying the type of not spot also shapes the practical steps available to you. Subscribers in a partial not spot can consider whether switching operator would resolve the problem, or can formally request that their operator outlines its deployment plans for the area. In a total not spot, no switch will help and the appropriate route is a community-level approach through the SRN governance process.
What This Means in Practice
Harriet lives in a hamlet called Fenwick Hollow in Northumberland. The Ofcom checker shows that two operators predict outdoor voice coverage at her postcode, but she receives no signal from her operator indoors and only marginal signal outdoors. She submits feedback through the checker specifying her postcode, her operator, the fact that both voice and 4G data are unavailable outdoors, and that this affects her ability to call 999 in an emergency. She also files a formal complaint with her operator. Eight weeks later, the operator's response confirms there are no planned coverage improvements. Harriet escalates to Ofcom and copies her MP, who raises it with DSIT. The aggregated feedback from her community, now documented across several formal submissions, places Fenwick Hollow on the list for SRN review in the next programme assessment cycle.
Related Guides
How We Verified This
This article is based on Ofcom's Connected Nations reports and the checker.ofcom.org.uk tool documentation, Ofcom's guidance on making complaints about mobile coverage, the Communications Act 2003 and Wireless Telegraphy Act 2006 as maintained on legislation.gov.uk, and GOV.UK guidance on the Shared Rural Network governance process.
Disclaimer: Kaeltripton.com is an independent UK editorial publisher. We are not regulated by Ofcom or the FCA and we do not sell or arrange mobile services, insurance, or financial products. This content is for general information only and is not legal, financial, or technical advice. Rules, prices, and operator policies change. Verify the current position with Ofcom, GOV.UK, the ICO, or your provider before acting. ICO registered ZC135439. Last reviewed: 2026-06-05.
Frequently Asked Questions
How do I report a mobile not spot?
Visit checker.ofcom.org.uk, enter your postcode, compare the predicted coverage against your experience, and use the in-tool feedback option to submit details. For a formal record, also make a coverage complaint directly to your mobile operator. Local councils and MPs can submit aggregated evidence to DSIT for systemic rural not spots that may qualify for Shared Rural Network intervention.
What happens when I report a not spot to Ofcom?
Ofcom incorporates feedback into the Connected Nations data process, which informs annual coverage reports and operator compliance monitoring. Individual reports do not automatically trigger infrastructure deployment, but a pattern of reports from the same location can influence Ofcom's assessment of whether an operator is meeting its coverage licence conditions and whether an area qualifies for SRN review.
Does reporting a not spot lead to improved coverage?
Not immediately, and not automatically from a single report. The pathway runs through Ofcom's regulatory cycle and the SRN governance process, both operating over months or years. Community-level submissions with aggregated evidence from multiple residents — backed by formal operator complaints and MP engagement — have the greatest practical chance of accelerating SRN deployment in a specific location.
What is the Ofcom coverage checker tool?
The Ofcom Mobile & Broadband Checker at checker.ofcom.org.uk allows anyone to enter a UK postcode or address and see predicted coverage from all four major operators across outdoor voice, outdoor 4G data, indoor voice, and indoor 4G data. The tool is based on propagation models submitted by operators; it also accepts consumer feedback to help calibrate the accuracy of those models over time.
What is a partial not spot?
A partial not spot is a 100-metre grid square where at least one of the four major mobile network operators (EE, O2, Three, Vodafone) provides coverage above Ofcom's minimum threshold, but at least one does not. Consumers on a non-covering operator experience a dead zone even though other subscribers in the same location may have a signal. Partial not spots are far more numerous than total not spots across the UK.
