Anyone still using an older mobile phone on the O2 network is being urged to upgrade now. The popular UK mobile provider has just issued a final warning ahead of the imminent shutdown of its 3G service in 2026. Those who fail to act in the coming weeks will be left without access to mobile internet or online services such as WhatsApp. O2, now part of Virgin Media O2, has confirmed it will switch off its 3G network within the next few weeks, with the company saying, “In early 2026, the network will soon be fully shut down.”

This update from O2 follows similar moves by rivals EE, Three and Vodafone who have all now scrapped 3G access. Once the service is deactivated, customers using 3G-only devices will lose all web services and must upgrade to a newer device with 4G and 5G technology.

Jeanie York, Chief Technology Officer at Virgin Media O2, said the decision reflects how mobile usage has evolved.

“We’re now more connected than ever thanks to significant investment in faster, more reliable 4G and 5G networks,” she explained. “As a result, 3G has become a relic of a bygone era.”

York added that Virgin Media O2 is on track to complete its switch-off in the coming weeks after a series of successful trials carried out throughout 2025.

The company says the change will affect only a small number of customers, most of whom should already have received messages outlining upgrade options. However, those who delay risk losing mobile data access once the network is turned off. While calls and text messages will continue to work, mobile internet services will not.

“Our 3G network has already been withdrawn across many parts of the UK, with the remaining areas set to follow shortly,” York said. “Although a 3G signal may still appear in some locations briefly in early 2026, the network will soon be fully shut down. Anyone still using a 3G-only handset should upgrade as soon as possible.”

Why is 3G being switched off?

3G technology can no longer meet modern demands. Devices limited to 3G typically reach speeds of around 6Mbps, compared with well over 100Mbps on 5G. Phasing out 3G also frees up valuable spectrum, allowing providers to expand and improve 4G and 5G coverage.

York explained that 3G now accounts for less than 2% of mobile data usage on the Virgin Media O2 network. “With usage in steep decline, the industry and government agreed in 2021 to retire 3G networks. This allows spectrum to be reallocated to 4G and 5G services, delivering faster speeds, more reliable streaming, and higher-quality voice calls for customers.”