O2 does not publish a public map of individual mast locations. The practical alternative is the official coverage checker at o2.co.uk/coveragechecker, which lets you enter any UK postcode to see predicted signal strength for 2G, 4G, 5G, 5G+ and O2 Satellite coverage in your area.
Go to o2.co.uk/coveragechecker and type in your postcode. The tool returns results across voice, 3G, 4G and 5G, with signal strength shown on a four-bar scale for both indoor and outdoor coverage. That indoor/outdoor split is useful because walls and building materials can cut signal considerably, so a strong outdoor reading does not always translate inside your home.
Third-party tools such as comparedial.com also let you check O2 signal alongside every other UK network in the same postcode, which helps if you are deciding whether to switch.
Yes. O2's network checker (also accessible via signalchecker.co.uk) lets you filter results by masts and Wi-Fi hotspots separately. O2 offers four different HotSpot options that can be paid for monthly, so if your mast coverage is patchy at home or work, a hotspot plan may fill the gap.
O2 5G launched on 17 October 2019, initially covering six UK locations. As of May 2026, the network covers over 77% of the UK population, according to 5g.co.uk, and is available across thousands of cities and towns. As O2 puts it on their own site: "Your signal's our priority - that's why we deliver thousands of upgrades every year for a stronger, more reliable connection."
O2 now offers a satellite service for areas where terrestrial masts do not reach. You need the O2 Satellite Bolt On and a compatible device to use it. Check the coverage checker to see whether your postcode qualifies.
Check for active network issues first at the O2 website, which lists any ongoing outages. If coverage is consistently poor rather than a temporary fault, O2 customer support is available by phone and online. Wi-Fi calling is another option on compatible handsets: it routes calls over your broadband connection when the mobile signal is weak.
## Quotations > Your signal's our priority - that's why we deliver thousands of upgrades every year for a stronger, more reliable connection. > — O2 (official website) (https://www.o2.co.uk/coveragechecker) > Use the official O2 coverage checker at status.o2.co.uk, enter any UK postcode to see predicted 4G/5G signal indoors and > — connection-technologies.co.uk (https://connection-technologies.co.uk/help/network-coverage/o2-coverage-checker-signal-guide) ## Frequently asked questions ### how do I check O2 coverage by postcode Visit o2.co.uk/coveragechecker and enter your postcode to see predicted signal strength for 2G, 4G, 5G, 5G+ and O2 Satellite coverage. Results show signal strength on a four-bar scale for both indoor and outdoor coverage, which is useful because walls can significantly reduce signal. ### does O2 publish a map of mast locations No, O2 does not publish a public map of individual mast locations. Instead, use the official coverage checker at o2.co.uk/coveragechecker to see predicted coverage in your area by postcode. ### can I filter O2 coverage by masts and hotspots Yes, O2's network checker lets you filter results by masts and Wi-Fi hotspots separately. O2 offers four different HotSpot options that can be paid for monthly, which can help fill coverage gaps if mast signal is weak at your location. ### what percentage of UK does O2 5G cover O2 5G covers over 77% of the UK population as of 2026. The network launched on 17 October 2019 in six initial locations and has since expanded to thousands of UK cities and towns. ### how do I compare O2 signal with other networks Use third-party tools like comparedial.com, which let you check O2 signal alongside every other UK mobile network in the same postcode. This is helpful if you're deciding whether to switch providers. ## Sources 1. [O2 Coverage Checker By Postcode](https://www.comparedial.com/mobile-coverage-checker/o2) (www.comparedial.com) 2. [O2 Coverage Checker](https://www.signalchecker.co.uk/networks/o2) (www.signalchecker.co.uk) 3. [O2 Coverage Checker: Check 4G/5G Signal by Postcode](https://connection-technologies.co.uk/help/network-coverage/o2-coverage-checker-signal-guide) (connection-technologies.co.uk) 4. [O2 5G Coverage - Check coverage in your area](https://5g.co.uk/coverage/o2/) (5g.co.uk) 5. [O2 Coverage Checker – 4G, 5G, 5G+ & Satellite](https://www.o2.co.uk/coveragechecker) (www.o2.co.uk)