We're launching O2 5G from the four corners of the UK later this year. Belfast, Cardiff, Edinburgh and London will be the first to benefit from our 5G network in 2019. Rollout of our 5G network will continue through 2019 and beyond. Find out more about O2 5G.
- 2G, 3G, 4G and other jargon
Second generation mobile network known as GSM. Simply put, 2G allows you to send text messages.
The third generation of mobile phone technology, offering better coverage for voice calls and text messaging, as well as providing faster access to the internet. All of our tariffs come with 3G as standard.
Also known as HSDPA (High Speed Data Packet Access), 3.5G provides faster data rates than 3G.
The fourth generation of mobile phone technology. With 4G, using the internet on your phone is even quicker, with speeds 5-7 times faster than 3G. If you have a 4G ready phone, but you’re not in a 4G area, you’ll still be able to use 3G.
The radio network used to send and receive calls and messages, and use the internet.
A fast, free wifi service available to everyone. You just download the app, and you’ll be connected to O2 Wifi whenever you’re in a hotspot.
You can connect to the internet using wifi, to browse the web, download applications, or send and receive emails, without using your 3G or 4G data.
O2 Pocket Hotspot
A portable gadget that connects you and up to four other people or devices to the internet, when there’s O2 mobile data coverage. The O2 Pocket Hotspot automatically connects to our mobile network as soon as you insert a Pay As You Go sim.
- Wifi and 4G Calling
Another way to stay connected with O2
Make and receive calls over wifi even if you can’t connect to the mobile network. Get clearer calls with 4G Calling. Both at no extra charge. To learn more, go to Wifi and 4G Calling.
You can use 4G Calling in many cities across the UK. Use the coverage checker to find out if it’s in your area.
Remember, Wifi Calling is available wherever there’s wifi, including wifi hotspots.
O2 Business customer? Go to Wifi and 4G Calling for business.
- Self help guide for network problems
You may be able to fix the problem yourself, with the following tips:
- Turn Airplane Mode on, then off again.
- Switch your device off, wait 10 seconds, then turn it back on.
- Charge your battery – a low battery can affect how well your phone connects to the network.
- Check your settings – try selecting the network manually and make sure data is turned on.
- Check your device is running the latest software version – this can improve its ability to connect to the network.
- Check your sim is 3G enabled – if it’s not, you won’t be able to connect to mobile data.
- If you're having issues in different locations, try your sim in another device. If it works then the problem is with your device.
- Try another sim card in your device, if this works then the problem is with your sim.
Still not sure what’s wrong? Take a look at our self help video and guide.
Need help with any of these tips? Check out our internet and network coverage troubleshooter. Just choose your device and follow the steps.
If it turns out that your device or sim is the problem, contact us and we’ll be happy to help.
If your device and sim seem to be ok, keep an eye on our network status checker for updates. These can take up to an hour to appear.
Once our live network status page shows that a fault has been fixed, you might need to turn your device off and on, to refresh your network connection.
Data reception and speeds may not be as good indoors or in a car. Signal can also be affected by buildings, trees and even weather conditions. This map is just a guide and does not guarantee signal coverage.