Wifi and 4G Calling

Another way to stay connected

Make calls with Wifi Calling when you don't have signal. 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 between wifi and 4G network coverage to continue your call. And you can still check your social media or send an email while you’re on the phone.

All the 4G and 5G devices we stock now support 4G and Wifi Calling.

On some Android devices, Wifi and 4G Calling will only work if you’re using O2 firmware. That’s essentially the software that makes your device turn on and run. Sometimes there are different versions of firmware for the same device. Find out more.

The best of wifi and 4G

WiFi symbol with people using different types of devices devices

How it works

  • 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, if it’s available. Check your coverage.

  • 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.
     

Set up Wifi and 4G Calling.

 

Businessman holding mobile phone in front of office building

No extra charges

 

  • You’ll be able to make calls, take calls and send and receive text messages (if you have a supported device that allows for SMS services over WiFi) 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 network while you’re making a call.
Young woman holding mobile phone on London underground

More places to connect

  • You’ll be able to make calls, take calls and send and receive text messages (if you have a supported device that allows for SMS services over WiFi) 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 network while you’re making a call.
wifi-calling-icon-device-detail-img-row-xxl-1100.jpg

Using Wifi and 4G Calling

Wifi and 4G Calling won’t work with some of our other services, including O2 Just Call Me, Mobex or Mobile Recording. You’ll need to remove them to use Wifi and 4G Calling. Don’t worry though – if you change your mind later, you can just 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.

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

More for you

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.

Google Setup

Go to Settings > Network & Internet > Mobile network > Advanced > Wi-Fi Calling and turn ‘On’

To switch off Wi-Fi Calling, tap the switch to ‘Off’

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.

Google Setup

Go to Settings > Network & Internet > Mobile network > Advanced > Set 4G Calling to ‘On’

To switch off 4G Calling, tap the switch to ‘Off’

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 or text message (if you have a supported device that allows for SMS services over WiFi). They will come out of your tariff allowances in the normal way, or they will be charged at the standard tariff rate if you run out.

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, Wifi Calling is not currently supported outside of the UK. However, in certain circumstances it may be possible to enable Wifi Calling whilst abroad and where used additional charges will apply.

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.

View all help articles