Millions of O2 customers across the UK are being urged to check their devices, as the mobile network provider confirms it will completely switch off its 3G services in 2026. The company has branded the older technology a "relic of a bygone era" and is advising users still reliant on 3G-only handsets to upgrade "as soon as possible" to avoid a total loss of mobile internet connectivity.
The End of an Era for Mobile Connectivity
The shutdown, set for 2026, will only affect a small minority of users who still own devices that cannot connect to 4G or 5G networks. According to O2, just two percent of its total mobile data traffic now runs on the 3G network, a figure that underscores its declining use. The provider states that affected customers should have already been contacted directly with information about their upgrade options.
Jeanie York, Chief Technology Officer at Virgin Media O2, explained the reasoning behind the move. "We're now more connected than ever thanks to significant investment in faster, more reliable 4G and 5G networks," she said. "As a result, 3G has become a relic of a bygone era." She confirmed that while a 3G signal might briefly appear in some locations in early 2026, the network will soon be fully deactivated nationwide.
Why O2 is Pulling the Plug on 3G
The decision is driven by technological progress and efficiency. The 3G network, which first brought reliable mobile internet to users in the early 2000s, can no longer meet modern demands for speed and capacity. By retiring this legacy system, O2 plans to reallocate the valuable radio spectrum to bolster its 4G and 5G infrastructure. This reallocation is expected to enhance internet speeds and expand the coverage of newer, faster networks across the UK.
O2 is not the first operator to take this step. Rivals including Vodafone, EE, and Three have already phased out their own 3G services in recent years. O2 has conducted extensive testing throughout 2025 to ensure a smooth transition for all customers when the switch-off occurs.
What Customers Need to Do Now
The message from O2 is clear: anyone using a device that only supports 3G must upgrade to a 4G or 5G-enabled handset. Failure to do so will result in a loss of mobile data services, meaning no internet browsing, maps, or social media when away from Wi-Fi. The provider emphasises that this change will not affect voice calls and texts, which will continue to operate over the 2G network.
This upgrade is crucial for staying connected on the move. Unlike Wi-Fi, mobile networks provide coverage over vast areas, with some remote connections even relying on satellites. The progression from 3G to 4G enabled the smartphone revolution and high-quality video streaming, while 5G offers vastly superior speeds and the capacity to support a future filled with connected devices.
Customers uncertain about their device's capabilities are advised to contact O2 directly or visit a local store for advice on securing a compatible upgrade before the 2026 deadline.
