Speed tests
Explore median performance metrics for O2, calculated from millions of real-world, crowdsourced speed tests. These results reflect typical everyday performance to help you compare carriers across the country. Search for a location to see how O2 performs in a specific area.
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Reliability
Technology
Explore the technical foundation of O2's network, including supported wireless technologies, spectrum frequencies, and available bands. This detailed breakdown highlights the capabilities that power coverage, capacity, and performance, along with the specific spectrum ranges used to deliver service across different areas. Use this information to understand device compatibility, network reach, and how O2's infrastructure supports real-world speeds and reliability.
Network codes
Mobile Country Code (MCC) and Mobile Network Code (MNC) are unique identifiers assigned to mobile network operators. Together, they form the Public Land Mobile Network (PLMN) identifier that your phone uses to identify and connect to O2's network. These codes are broadcast by cell towers and are used for network selection, roaming agreements, and regulatory compliance. This list contains the codes used by O2 that are currently in active use.
| MCC | MNC | PLMN |
|---|---|---|
| 234 | 10 | 234-10 |
| 234 | 2 | 234-2 |
Network routing
Autonomous Systems are groups of networks that participate in global internet routing. They are typically managed by companies, organizations, governments, or other entities. Each autonomous system is assigned a unique number that identifies them called an Autonomous System Number (ASN). When your phone connects to the internet, it's assigned an IP address that is managed by the autonomous system. The autonomous system then determines how that traffic is routed to and from the internet. Below are the autonomous systems used by O2 for its cellular network.
O2
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Speed and reliability ratings for O2 and the other major carriers in the United Kingdom, from crowdsourced speed tests.
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Rated fair overall here, with reliability its strongest score.
Bars compare each carrier with the best result here. Speeds are medians from real speed tests.
The fastest and most consistent network here.
Bars compare each carrier with the best result here. Speeds are medians from real speed tests.
Rated good overall here, with performance its strongest score.
Bars compare each carrier with the best result here. Speeds are medians from real speed tests.
Has the slowest downloads here.
Bars compare each carrier with the best result here. Speeds are medians from real speed tests.
Overview
O2 is a major mobile network operator in the United Kingdom. Operating its own cellular network infrastructure including cell towers, spectrum licenses, and core network equipment. As an MNO, O2 provides direct network access and is responsible for network quality and coverage expansion. It is owned by Virgin Media O2. With approximately 22.8 million subscribers as of 2025, O2 is considered a major carrier in the United Kingdom.
FAQ
Our coverage insights come from crowdsourced test data, so community feedback is a key part of improving accuracy. If you spot incorrect details for O2, send us a report and we will review and update the data as needed.
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