4G

4G is the fourth generation of mobile network technology. It powers smartphone data across almost the entire UK and also drives 4G home broadband, where a router uses the mobile signal instead of a fixed line. Real world speeds usually sit between 20 and 80 Mbps in decent coverage.

What it actually means

4G is the fourth generation mobile standard, introduced in the UK from 2012 onwards. It replaced 3G as the workhorse for mobile data and is now the default network your phone connects to whenever 5G isn't available. Coverage across the UK is close to universal outdoors, so most people experience 4G every day without thinking about it.

In terms of performance, 4G typically delivers download speeds of 20 to 80 Mbps in a strong signal area, with latency around 30 to 50ms. That's plenty for streaming video, video calls, navigation, social apps and everyday browsing on a phone. Beyond mobiles, 4G is also used as a fixed wireless connection for the home. A small router with a SIM card inside picks up the signal from a nearby mast and shares it over Wi-Fi, which is useful in areas where fibre hasn't arrived or a landline install isn't practical. It's worth keeping that distinction in mind: 4G is the network technology, while 4G home broadband is one product built on top of it.

At home

What this looks like in the house

Picture the family in a stone built cottage who've been waiting two years for the fibre roll out to reach their lane. Or the renter in a Victorian conversion whose landlord won't allow holes drilled for an Openreach line. Or the person who can finally get a usable signal in the back garden now the mast nearby has been upgraded. 4G is what carries their phone calls when WiFi cuts out, what streams the football on the iPad in the kitchen, and what gets the house online when a fixed line just isn't an option.

In business

What this looks like at work

For an SME the felt cost shows up the morning a card terminal won't connect and a queue builds at the till. The pop-up shop opening for a six week run who can't wait ten weeks for a fibre install. The site office on a new build who need internet from day one. The mobile sales team taking orders on tablets between client visits. 4G is what keeps tills ringing, vehicle trackers reporting and field teams connected, whether that's through a mobile SIM in a phone or a 4G router in a portable cabin.

The Inspire approach

Connection Matters

How we'd handle this if you were our customer

Inspire uses 4G in two ways. Our 4G/5G Home Broadband puts a 4G capable router in homes and businesses where fibre isn't available, with the same kit powering /holiday-park-broadband for static caravans and lodges. We check coverage at your postcode before you order, so you know what speeds are realistic. For phones and tablets, Inspire Mobile SIMs (/mobile-sims for residential, /business-mobile-sims for SMEs) give you a choice of all four UK networks, EE, Three, Vodafone and O2, so you can pick the 4G map that works best where you actually spend your time. As the UK's #1 Internet Provider on Trustpilot with 600+ reviews, the support sits behind every connection.

Questions, answered

Frequently asked about 4G

What's a good 4G speed in the UK?

In a strong 4G signal area you'll usually see 20 to 80 Mbps download and 5 to 20 Mbps upload, with latency around 30 to 50ms. That's plenty for streaming, video calls and normal phone use. Speeds dip in busy spots like train stations and city centres at peak times because the local mast is shared with everyone else nearby.

Is 4G good enough for working from home?

For most home workers, yes. 4G handles Teams, Zoom, email, cloud apps and HD video without trouble in a decent coverage area. If your job involves heavy file uploads, big video editing files or several people streaming and gaming at once, you'd feel the difference compared to fibre or 5G. We check your postcode coverage before recommending 4G home broadband so you know what to expect.

Will 4G be switched off like 3G?

Not in the foreseeable future. UK networks have switched off 3G to free up spectrum for 4G and 5G, but 4G is the backbone of mobile data and will be supported for many years to come. 5G is being layered on top of 4G rather than replacing it, and most phones still drop back to 4G whenever a 5G signal isn't available.

Where to next

Inspire pages built around this

4G & 5G Home Broadband

Wireless broadband for homes and businesses without a fibre option.

Mobile SIMs

Pick from EE, Three, Vodafone or O2 for the best 4G map near you.

Business Mobile SIMs

Multi-network 4G SIMs for field teams, sites and mobile sales.

Keep reading

Related glossary terms

5G 4G Home Broadband 5G Home Broadband MVNO (Mobile Virtual Network Operator)FTTP (Fibre to the Premises)

Back to the full glossary

Last reviewed 2026-05-20

What it actually means

What this looks like in the house

What this looks like at work

How we'd handle this if you were our customer

Frequently asked about 4G