Wifi and 4G Calling
No signal? No problem, with Wifi Calling. Whether you’re at home, in a coffee shop or at the office, if you’re having a signal problem, you can use wifi to call as normal. And 4G Calling lets you make calls over 4G, meaning clearer calls.
With Wifi and 4G Calling you’ll move seamlessly and uninterrupted between wifi and 4G network coverage to continue your call, while being able to check your mail or browse the internet at the same time.
Wifi and 4G Calling is available on many of our devices*
Check if your device is supported.
*For some Android devices, Wifi and 4G Calling will only work on devices using O2 firmware. To learn more and check if your device is compatible click here.
The device firmware is essentially the software that makes your device turn on and run. Sometimes there are different version of firmware for the same device.
The best of wifi and 4G
How it works
- With an eligible device you’ll be able to start your call over wifi in the office, and as you step outside you’ll seamlessly move onto our 4G network (where available – use our coverage checker).
- Once we’ve set you up and you’ve switched it on in your phone’s settings, you’re good to go. No need to sign up, register or download an app.
No extra charges
- Your calls are included as part of your usual tariff allowance, and out-of-tariff calls are charged at your standard rate.
- If you're connected to a wifi network, or you've got a 4G signal, you'll automatically use Wifi and 4G Calling, you don't have to do anything once you've set it up.
More places to connect
- You’ll be able to make and take calls wherever you have a wifi connection meaning you can stay in touch in more places than ever, with more public places being added all the time.
- You’ll also be able to multitask by browsing the internet or using apps on our fast 4G network while you’re making a call.
Using Wifi and 4G Calling
Wifi and 4G Calling won’t work with some of our other services including O2 Just Call Me, Mobex, Mobile Recording or Asavie. You’ll need to remove them to use Wifi and 4G Calling. Don’t worry though, if you change your mind later you can always switch back through My O2 or your Business Advisor.
More about Wifi and 4G Calling
Coverage and connectivity
- Check your network coverage
See what O2 network coverage is like where you are.
- More about O2 Wifi
Free wifi when you're out and about.
- More about 4G
The things you love, in an instant.
- Help and support
Your questions answered.
Help and support
- How do I set up Wifi Calling?
iPhone setup
Go to Settings > Phone > Wi-Fi Calling. Make sure Wi-Fi Calling is set to 'On'.
Can't see these settings on your device? Follow our set-up instructions.
Samsung setup
Go to Settings > Connections > Wi-Fi calling. Make sure Wi-Fi calling is set to On.
To switch off Wifi Calling, set the toggle to Off.Can't see these settings on your device? Follow our set up instructions.
Sony Setup
Go to Settings > More > Wi-Fi calling. Make sure Wi-Fi calling is set to On.
To switch off Wifi Calling, set the toggle to Off.
Can't see these settings on your device? Follow our set up instructions.OnePlus setup
Go to Settings > SIM & network > Enhanced communications. Make sure Wi-Fi calling is set to On.
To switch off Wifi Calling, set the toggle to Off.
Can’t see these settings on your device? Follow our set up instructions.
HTC setup
Go to Settings > Call > tap on Wi-Fi Calling to turn on.
To switch off Wifi Calling, tap to remove the tick.
Can’t see these settings on your device? Follow our set up instructions.
- How do I set up 4G Calling?
iPhone setup
Go to Settings > Mobile Data > Mobile Data Options > Enable 4G and then Voice & Data to enable 4G calling.
Can't see these settings on your device? Follow our set-up instructions.
Samsung setup
Go to Settings > Connections > Mobile networks > 4G calling. Set this to ‘On’
To switch off Wifi Calling, set the toggle to Off.
Can't see these settings on your device? Follow our set-up instructions.
Sony
Go to Settings > More > Mobile networks > Enable VoLTE. Make sure Wi-Fi calling is set to On.
To switch off Wifi Calling, set the toggle to Off.
Can't see these settings on your device? Follow our set-up instructions.
OnePlus setup
Go to Settings > SIM & network > Enhanced communications. Make sure Enable VoLTE (4G Calling) is set to On.
To switch off 4G Calling, set the toggle to Off.
Can’t see these settings on your device? Follow our set-up instructions.HTC setup
Go to Settings > Call > tap on 4G Calling to turn on.
To switch off 4G Calling, tap to remove the tick.
Can’t see these settings on your device? Follow our set-up instructions.
- How do I pay for Wifi and 4G Calling?
It’s no different to a standard call. It will come out of your call allowance, (or charged at the standard tariff rate if you run out) in the normal way.
- Where can I use Wifi Calling?
Wherever there’s wifi, including anywhere O2 Wifi is available.
- Can I use Wifi and 4G Calling to make calls abroad?
No, but you can use O2 Travel to make cheaper calls while you’re abroad. If you’re an O2 Business customer you can use O2 Travel in Europe or our Rest Of World 24 Hour Pass to stay connected while you’re away.