Wifi and 4G Calling

Another way to stay connected with O2

  • Make and receive calls with Wifi Calling even if you can’t connect to the mobile network. Get clearer calls and better indoor coverage with 4G Calling. Both at no extra charge.
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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.

From launch, Wifi and 4G Calling is available to iPhone 7 and 7 Plus customers on Pay Monthly, sim-only and business tariffs, with more devices coming very soon.

If you have a compatible iPhone you can set it up now – watch our video.

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 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.

Get set up now – Watch our video

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 on the London Underground using wifi, and more public places are being added all the time. Calls on 4G should also sound much better.

  • You’ll also be able to multi-task 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 TU Go (or O2 Just Call Me, Mobex or Mobile Recording for business customers). 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.






Terms apply

More about Wifi and 4G Calling

Coverage and connectivity

Check your network coverage

See what O2 network coverage is like where you are.

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More about O2 Wifi

Free wifi when you're out and about.

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More about 4G

The things you love, in an instant.

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Help and support

Your questions answered.

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Help and support

How do I set up Wifi Calling?

iPhone 7 or 7 Plus

Go to Settings > Phone > Wi-Fi Calling. Make sure Wi-Fi Calling is set to 'On'.

Check you’ve got the latest software – find out more

How do I set up 4G Calling?

iPhone 7 or 7 Plus

Go to Settings > Mobile Data > Mobile Data Options > Enable 4G and then Voice & Data to enable 4G calling.

Check you’ve got the latest software – find out more

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.

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Where can I use Wifi Calling?

Wherever there’s wifi, including the London Underground where O2 Wifi is available.

Find out more

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.