Mobile network O2 has issued a final, urgent warning to customers across the UK who are still using older handsets reliant on 3G technology. The provider, now operating as Virgin Media O2, is in the final stages of completely deactivating its 3G network, a process set to conclude within the coming weeks.
What the 3G Switch-Off Means for Your Device
Once the 3G signal is permanently turned off, the impact on users with 3G-only devices will be significant. These customers will lose all access to mobile data when they are away from a Wi-Fi connection. This means services like web browsing, email, and popular messaging platforms such as WhatsApp will no longer function on the go.
However, it's not a complete blackout for these phones. Basic voice calls and traditional SMS text messaging will continue to work normally, as these services are carried over the remaining 2G network, which is not being switched off.
The Timeline and Reason Behind the Change
The nationwide shutdown follows a series of successful pilot programmes run throughout 2025. While the 3G network has already been withdrawn in many parts of the country, the final areas are scheduled to have their signal switched off in early 2026. This move mirrors actions already taken by other major UK operators, including EE and Vodafone.
The decision to retire 3G is driven by technology and demand. The ageing 3G platform offers speeds of only around 6Mbps, which is vastly slower than modern 4G and 5G networks. By decommissioning 3G, O2 can reallocate the valuable radio spectrum to enhance the capacity, speed, and reliability of its 4G and 5G services for the vast majority of users.
Jeanie York, O2's Chief Technology Officer, confirmed that 3G now accounts for less than 2% of the total mobile data used on their network. This steep decline in usage led to a landmark 2021 agreement between the UK government and mobile industry leaders to phase out the legacy technology.
Who is Affected and What Should They Do?
The change is expected to impact only a very small segment of the population who still own older, 3G-only mobile devices. O2 has stated it is directly contacting these individuals via text message to inform them of the situation and outline their options.
The provider is strongly urging any affected customer to upgrade their handset as soon as possible. Visiting an O2 store or calling the provider's customer service line are the recommended steps to secure a device with 4G or 5G connectivity. Making this switch will not only restore full mobile internet access but will also provide access to higher-quality Voice over LTE (VoLTE) calls.
For those unsure about their device's capabilities, checking the phone's settings or specifications online can clarify whether it supports 4G or is limited to 3G. Taking proactive action now ensures a seamless continuation of mobile services.
