Mobile network
A mobile network is a wireless communication system that manages the transmission of voice calls and data between devices. On this page, we explain how mobile communication works, which networks are available in the UK, and the differences between the various generations of technology.
What is a mobile network?
In essence, a mobile network consists of three main parts: your device, a base station (often called a mast or cell site), and the core network. When you make a call or browse the web, your phone connects to a nearby base station via radio waves. This station then contacts the core network, which routes your data to its destination.
Your SIM card – whether a physical card or an eSIM – acts as your digital identity. It tells the network who you are and which services are included in your monthly SIM only or Pay As You Go plan.
Do all providers have their own network?
No. The UK has four “primary” Mobile Network Operators (MNOs) that own the physical masts and infrastructure: EE, Three, Vodafone, and Virgin Media O2.
All other providers, such as Sky Mobile or SMARTY, are called MVNOs (Mobile Virtual Network Operators). They lease space from one of the “Big Four”.
Which providers share networks?
- EE: 1pMobile, Lyca Mobile, Your Co-op, Ecotalk, Utility Warehouse.
- O2: Giffgaff, Sky Mobile, Tesco Mobile, Virgin Mobile.
- Three: iD Mobile, SMARTY, Honest Mobile.
- Vodafone: VOXI, Asda Mobile, Lebara Mobile, Talkmobile.
The evolution: 2G to 5G
2G/GSM
The oldest tech still in use. 2G enabled digital calls and texts. While it’s incredibly slow for data, it is still used today as a backup for voice calls in remote areas and for some “Internet of Things” devices like smart meters.
3G
3G sparked the smartphone revolution, but it has now been decommissioned in the UK. As of 2026, all major providers have switched off their 3G signals to repurpose the frequencies for faster, more efficient 4G and 5G networks.
4G (LTE)
4G is the backbone of mobile internet today. It is roughly 10 times faster than 3G and supports high-definition video streaming and fast browsing. Most 4G networks now support 4G calling (VoLTE), which allows you to make high-quality voice calls over the data network.
5G and 5G Standalone
The latest generation offers near-instant response times (low latency) and speeds that can rival home broadband. By 2026, most UK cities are covered by 5G Standalone (5G SA). Unlike early 5G, which was bolted onto 4G tech, 5G SA is a dedicated network that provides more reliable connections in crowded areas and better battery life for phones.
The 2G and 3G switch-off: What you need to know
As of 2026, the mobile landscape in the UK has changed significantly. All major networks have now fully switched off their 3G networks.
Why has 3G been turned off?
Providers have retired 3G to make better use of the radio spectrum. By reallocating these frequencies to 4G and 5G, networks can offer faster speeds, better reliability, and more capacity. Newer networks are also significantly more energy-efficient, helping providers meet environmental targets.
What about 2G?
While 3G is gone, 2G is also being phased out. The UK government and all mobile operators have committed to switching off 2G services by 2033 at the latest. However, some providers may choose to retire it sooner. Currently, 2G remains as a legacy fallback for basic voice calls and texts in very remote areas, and for older IoT devices like smart meters.
What does this mean for me?
If you are using a very old device that only supports 2G or 3G, you will no longer be able to use mobile data, and you may find that you cannot make calls or send texts. To stay connected, you will need a device that supports 4G calling and 5G.
If you have a modern phone but are experiencing poor call quality or slow data, you may need to manually adjust your settings to ensure your device is prioritising the newer networks.
How to update your network settings
If your device hasn’t automatically switched to the best available network (4G or 5G), follow these steps to ensure you’re ready for the post-3G era.
On iPhone (iOS 17 or later)
- Open Settings.
- Tap Mobile Service (or Mobile Data).
- Select Mobile Data Options > Voice & Data.
- Choose 5G Auto or 4G.
- Ensure 4G Calling (or VoLTE) is toggled ON to ensure high-quality voice calls now that 3G is unavailable.
On Android
- Open Settings.
- Tap Network & Internet > SIMs.
- Select your active SIM and look for Preferred network type.
- Choose 5G (recommended) or 4G/LTE.
- Ensure VoLTE or 4G Calling is enabled.
When it comes to Android phones, please remember that the menu options may vary slightly between different manufacturers, but the example above gives you an idea of what to expect.
How do you set up a network on a mobile router?
If your mobile router is not connecting to 4G or 5G, first ensure that the device is not too old; 3G-only routers will no longer work in the UK. For 4G or 5G capable routers, the device should automatically select the best available network.
If the device doesn’t automatically select the best network, try this:
- Restart the device: A simple power cycle often forces the router to reconnect to the strongest mast.
- Check the Admin Panel: Log in to your router’s web interface (usually by typing 192.168.0.1 or similar into your browser) and ensure the “Network Mode” is set to Auto or 4G/5G Only.
- Check firmware updates: Ensure your router’s software is up to date, as providers often release updates to improve network compatibility.
If you are still having issues, a factory reset can be used as a last resort to clear any incorrect manual settings. Keep in mind this will reset your Wi-Fi name and password to the defaults printed on the sticker under the device.
What to do if you experience network issues
- Check the Status Checker: Every UK network has an online “Status Checker” where you can enter your postcode to see if there is a mast down in your area.
- Toggle Flight Mode: This forces your phone to reconnect to the nearest mast.
- Check settings: Ensure your phone isn’t restricted to “2G only” or “4G only” in the settings menu, rather than allowing 5G.
