Overview
Speed comparisons between WiFi and mobile data depend on which type of WiFi and which generation of mobile network you're comparing. The UK has a wide range of broadband speeds — from ageing ADSL lines at 10–20 Mbps to full-fibre connections at 1 Gbps — and mobile speeds ranging from 4G's 25–50 Mbps average to 5G's potential 100–400 Mbps in cities.
Home WiFi Speeds in the UK
Average UK home broadband speed is approximately 70–80 Mbps download according to Ofcom's Connected Nations reports. However, this average conceals a wide range:
- ADSL (copper telephone line): 10–25 Mbps download, 1–3 Mbps upload — still present in rural areas
- FTTC (fibre to the cabinet): 30–80 Mbps download, 10–20 Mbps upload — the most common UK connection type
- FTTP / full fibre: 100 Mbps to 1 Gbps download — expanding rapidly; available to ~55% of UK premises as of 2025–26
Actual WiFi speed in your home is lower than your broadband line speed due to router placement, wall absorption, and the number of connected devices sharing the connection. A 100 Mbps fibre line might deliver 60–80 Mbps to a phone two rooms away.
4G Mobile Data Speeds
Average 4G download speeds in the UK are approximately 25–45 Mbps, with peak speeds up to 150 Mbps in uncongested areas with strong signal. Upload speeds average 10–20 Mbps. Latency is typically 30–60ms — slightly higher than a wired broadband connection but perfectly adequate for most tasks.
In practice, 4G speeds vary significantly by location, time of day, and network. A user on EE in a city centre may get consistent 40–60 Mbps; the same user in a rural village might drop to 5–15 Mbps. Network congestion in busy areas (commuting hours, sports events, concerts) can temporarily reduce 4G speeds.
5G Mobile Data Speeds
Where 5G is available, download speeds of 100–400 Mbps are typical, with peak speeds exceeding 1 Gbps in ideal conditions. Upload speeds on 5G average 30–80 Mbps. Latency drops to 10–20ms, making 5G competitive with home broadband for gaming and video calls.
In the UK, 5G is currently available in 80–150+ locations depending on the network. EE and Three have the widest 5G footprints. Outside 5G coverage, devices automatically fall back to 4G.
| Connection type | Typical download | Typical upload | Latency |
|---|---|---|---|
| ADSL (home) | 10–25 Mbps | 1–3 Mbps | 10–30ms |
| FTTC (home) | 30–80 Mbps | 10–20 Mbps | 10–20ms |
| FTTP full fibre | 100 Mbps – 1 Gbps | 50 Mbps – 900 Mbps | 5–10ms |
| 4G mobile | 25–45 Mbps avg | 10–20 Mbps | 30–60ms |
| 5G mobile (city) | 100–400 Mbps | 30–80 Mbps | 10–20ms |
| Public WiFi (café/hotel) | 5–50 Mbps (variable) | 2–20 Mbps | 10–40ms |
When to Use WiFi vs Mobile Data
Use WiFi when: you're on FTTP or fast FTTC and want consistent speed for large downloads, video streaming in 4K, or gaming. Home WiFi on a good fibre connection will generally be more stable than mobile data for sustained high-bandwidth tasks.
Use mobile data when: you're on slow ADSL or FTTC broadband and have a good 4G/5G signal. On 5G, mobile data is often faster than average home broadband. Also prefer mobile data over open public WiFi for any sensitive activity — 4G/5G has built-in encryption; public WiFi does not.
APN Settings and Mobile Data
Your phone's APN settings control how it connects to your mobile network for data and MMS. Incorrect APN settings can prevent mobile data from working entirely, or cause it to be slow and unstable. If your mobile data seems slow even in a good coverage area, verifying your APN settings is one of the first troubleshooting steps.
If mobile data stops working after a network update or SIM change, see our troubleshooting guides for step-by-step fixes.