By Compare The Networks editorial team. Published 2026-10-06. Content reviewed 2026-10-06.

How to Check Business Mobile Coverage Before Switching

Check mobile coverage where people do their work, using a postcode map as a starting point and practical tests where possible. The important locations may include the office, a warehouse, employees' homes and regular customer sites.

A national headline cannot tell you whether a receptionist can answer a call inside your building. Build a small coverage brief before comparing networks, then use the same locations and tasks to assess each candidate.

Make a location list

Ask staff where calls fail or data is unreliable. Record the address, relevant rooms and the work affected. Include premises where the team spends time even if they are not owned by the business.

Keep critical locations separate from occasional ones. A poor connection at your main dispatch desk has a different consequence from a weak signal at an infrequent meeting venue. This helps you evaluate trade-offs rather than chasing a perfect result everywhere.

Use coverage maps to shortlist

Ofcom's Map Your Mobile provides indoor and outdoor coverage information. Its guidance explains that buildings, walls and other local factors can make actual experience differ from predictions.

Check the address and inspect the relevant area of the map. Compare the coverage type rather than treating every coloured area as an equivalent result. Keep the date and location of the check with your buying brief.

Ask each proposed provider about any additional checks it recommends for the exact business tariff and devices. Save those answers alongside the maps so the procurement decision has a written basis.

Test real work, not just signal bars

If practical, use a suitable test connection in the intended handset. Check indoor calls, outgoing calls, a customer-facing application and a small file transfer. Repeat at the places where staff report problems.

Signal bars are a quick visual clue, but your acceptance test should be the task people need to complete. A phone showing a connection is little comfort if an order cannot be uploaded from the stockroom.

Use the same tasks for each network under consideration. Note the handset and any settings that affect the result.

Check different working conditions

Run tests during a normal working day where possible. Ask whether performance changes at busy times or in different parts of the premises. Avoid basing a company-wide move on a single test from the car park.

For mobile staff, record problems at regular stops. Have a passenger record observations on journeys; never ask a driver to operate a phone while driving. A route assessment should be organised safely and focus on places where connectivity is operationally important.

Assess Wi-Fi calling as a separate option

If indoor mobile signal is weak, ask whether the proposed handset and tariff can use Wi-Fi calling. Check the business broadband connection and test the intended setup. Treat it as an option to verify rather than a promise that every indoor problem will disappear.

For premises where broadband also fails, consider how staff will contact customers during an outage. It is useful to understand which communications depend on the same connection before calling something a backup.

Decide what would make you reject a proposal

Write down the essential locations and minimum tasks that must work. Agree who will review the test results. If a critical task fails, ask for further investigation before signing rather than assuming a different phone will fix it.

If staff work in different regions, a mixed-network approach may be worth discussing. Ask how billing and administration would work and assess whether the extra complexity fits the business.

Bring this coverage brief into the business mobile quote checklist. It makes the comparison about the work your company needs to do.