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Three brilliant ways to get the best connection
See what you can do with O2 WiFi Calling, 4G Calling and 5G Calling.
| WiFi Calling | 4G Calling | 5G Calling | |
|---|---|---|---|
| What your phone uses | WiFi connection | O2 4G mobile network | O2 5G+ mobile network (if you're a Pay Monthly customer) |
| Where you can get signal | Indoors and low signal areas with WiFi connection | Areas with strong 4G coverage | Busy and high-demand areas with 5G+ coverage |
| Benefits | Make calls where there is no signal | Clear call quality | Even clearer voice quality, faster connection and more reliable calls |
| Connectivity | Uses WiFi network | Uses O2 mobile 4G network | Uses O2 mobile 5G+ network |
| Supported devices | All our 4G and 5G devices support 4G and WiFi Calling | All our 4G and 5G devices support 4G and WiFi Calling | 5G Calling compatible handsets*:
|
| Requirements | An O2 SIM, WiFi connection and a compatible device and software | An O2 SIM and a compatible device and software | An R15 SIM and a compatible device and software |
| Type of plan | Pay Monthly and Pay As You Go | Pay Monthly and Pay As You Go | Pay Monthly |
*More devices coming soon
Use our device help guides to find out more about setting up WiFi Calling on your phone. For 4G and 5G Calling, all you need is our latest R15 SIM and an eligible device with latest software.
The best of WiFi , 4G and 5G+
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How WiFi Calling, 4G Calling and 5G Calling works
Start your call using your local WiFi network and, as you step outside, move onto our 4G and 5G+ network – check your coverage to see availability
To use 4G and 5G Calling, make sure you have an R15 SIM and you're using a compatible device – the settings will then be automatically enabled
WiFi Calling will usually be enabled automatically if you have a 4G or 5G handset and a good WiFi connection
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No extra charges
Calling and messaging over WiFi, 4G or 5G+ is no different to making a standard call or sending a standard text*
Your calls and texts come out of your monthly tariff allowances, or charged at the normal tariff rate
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More places to connect
You can make calls, take calls and send and receive texts* wherever you have a WiFi connection – so you can stay in touch in more places than ever
You'll still be able to use the internet or apps on our 4G and 5G+ networks while you're making a call
FAQs
To use 4G Calling, make sure you have an O2 SIM and any 4G /5G device. Once these requirements are met, the settings will be enabled automatically.
For WiFi Calling, if you have a 4G or 5G handset and a good WiFi connection, it should also be enabled automatically. If you experience any issues, you can use the device help guides to find more information on how to set up and use WiFi Calling on your phone.
Using either WiFi, 4G or 5G+ to stay connected costs the same as a standard call or text*, this means it'll come out of your tariff allowances in the normal way. If you run out, you’ll be charged at the standard tariff rate.
You can use it wherever there's a WiFi connection, including anywhere O2 WiFi is available.
Yes, 4G and 5G Calling are available abroad in selected locations. WiFi Calling isn’t currently supported outside of the UK.
5G Calling is currently available for O2 Pay Monthly customers with an R15 SIM and a compatible device* on latest software. If you’re in a supported area, your device will automatically connect to 5G Calling.
You can use 5G Calling on the handsets listed below when using an R15 SIM and the latest software version, with more compatible devices becoming available soon:
iPhone 15, 15 Plus, 15 Pro, 15 Pro Max, 16, 16 Plus, 16 Pro, 16 Pro Max, 16e, 17, Air, 17 Pro Max, 17 Pro and 17e
Galaxy S26, S26+, S26 Ultra, S25, S25 Edge, S25 Ultra, S25 FE, Z Flip7, Z Flip7 FE and Z Fold7
Pixel 9a, 9, 9 Pro Fold, 9 Pro XL, 10, 10a, 10 Pro, 10 Pro XL & 10 Pro Fold
Choose your new phone
Grab a deal on the latest Samsung, Apple and Google Pixel phones. Choose from a range of flexible custom plans to suit your lifestyle and budget.
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Coverage and connectivity
See what O2 network coverage is like where you are
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WiFi Calling, 4G Calling and 5G Calling
Discover how to keep in touch and stay connected with WiFi, 4G and 5G Calling
*If you have a supported device that allows for SMS services over WiFi.