What is 4G?

4G is the fourth generation of mobile network technology, standardised under the Long Term Evolution (LTE) specification. It replaced 3G as the primary mobile data standard in the UK from around 2012, with EE launching the first UK 4G network in October 2012.

4G delivers substantially faster data speeds than 3G, lower latency, and better spectral efficiency – meaning the network can carry more data per unit of radio spectrum. It is the technology that made mobile video streaming, cloud applications, and always-on mobile internet practical.

How 4G works

4G uses radio frequencies (bands) allocated by the UK regulator Ofcom. UK 4G networks operate primarily on 800 MHz (good for rural coverage and building penetration), 1800 MHz, 2100 MHz, and 2600 MHz (higher capacity in urban areas). Your device connects to the nearest base station and communicates on these frequencies to send and receive data.

LTE uses OFDMA (Orthogonal Frequency Division Multiple Access) to divide the available spectrum into multiple subcarriers, enabling efficient simultaneous use by many devices. LTE-Advanced (4G+) introduced carrier aggregation – combining multiple frequency bands to increase peak speeds.

4G speeds in the UK

Ofcom’s 2025 Connected Nations report showed median 4G download speeds in the UK of approximately 25-35 Mbps, with urban areas achieving higher speeds. Peak speeds in ideal conditions can reach 150 Mbps on LTE-Advanced. Upload speeds are typically 10-20 Mbps. Latency is usually 30-50ms.

In practice, real-world speeds depend heavily on how many users are connected to the same base station, your distance from it, and physical obstacles between you and the mast.

UK 4G coverage

By 2026, 4G outdoor coverage in the UK exceeds 99% of premises for all four major operators (EE, Vodafone, O2, Three). Indoor coverage and rural road coverage remain lower. EE generally leads on rural coverage. The Shared Rural Network (SRN) programme has extended 4G coverage to many previously uncovered rural areas.

4G for mobile broadband dongles

4G remains the most widely supported standard in UK mobile broadband dongles. A 4G dongle will work on all four UK networks and provides speeds adequate for video calls, HD streaming, and general web use. If you need faster speeds and have 5G coverage at your location, see our 4G vs 5G comparison.