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.
Find out more

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 to iPhone 7, 7 Plus , Galaxy S7 and S7 edge customers on Pay Monthly, sim-only and business tariffs, with more devices coming very soon. Your S7 or S7 edge will need to have been bought directly from O2 and use O2 firmware*. You can check if your phone has the right firmware here.

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.

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 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 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

*The device firmware is essentially the software the makes your device turn on and run. Sometimes there are different versions of firmware for the same device.

More about Wifi and 4G Calling

Coverage and connectivity

Check your network coverage

See what O2 network coverage is like where you are.

Find out more
More about O2 Wifi

Free wifi when you're out and about.

Find out more

More about 4G

The things you love, in an instant.

Find out more

Help and support

Your questions answered.

Find out more

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'.

Samsung Galaxy S7 or S7 edge

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.

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.

Samsung Galaxy S7 or S7 edge

Go to Settings > Connections > Mobile networks > 4G calling. Set this to ‘On’
To switch off Wifi Calling, set the toggle to Off.

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.

Find out more

Where can I use Wifi Calling?

Wherever there’s wifi, including anywhere 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.