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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 2023. Rollout of our 5G network will continue through 2023 and beyond. Find out more about O2 5G.

2G

Second generation mobile network known as GSM. Simply put, 2G allows you to send text messages.

3G

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.

3.5G

Also known as HSDPA (High Speed Data Packet Access), 3.5G provides faster data rates than 3G.

4G

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What is 4G Calling?

Some phones support 4G Calling (also called Voice over LTE or VoLTE). 4G Calling lets you make clearer voice calls using our award-winning 4G network. If 4G Calling is available, you can just dial the number you want to call like normal. You can check 4G Calling coverage with our coverage checker.

Cellular network

The radio network used to send and receive calls and messages, and use the internet.

O2 Wifi

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.

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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.

What is Wifi Calling?

Some phones can use wifi to make voice calls. Wifi Calling (also called Voice over Wifi or VoWifi), helps you make and receive calls even if you can't connect to the mobile network, like when you're on the London Underground. When connected to wifi, you can just dial the number you want to call like normal.

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You can fix the problem yourself by using our online internet and network coverage troubleshooter which provides a device-specific, step-by-step guide to fix a variety of network and connectivity issues.

If you’re having issues in different areas, try your sim in a different O2 device. If the problem stops, there’s an issue with your device. And if a different O2 sim works in your device, then there’s a problem with your sim.

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If no issues show up and your phone and sim seem to be ok, keep an eye on the Status Checker for updates (these may take up to an hour to appear). Once the live status page shows a fault has been fixed, you might need to turn your device off and on to refresh your network connection.

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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.

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Please note: Wifi and 4G Calling is only available to O2 customers.