Poor mobile network coverage can make phone calls frustrating, especially inside buildings, basements or areas where cellular signals are weak. But if your smartphone and telecom connection support Wi-Fi Calling, you may still be able to make and receive regular calls using a Wi-Fi network.

The feature is particularly useful when your home has a strong broadband connection but weak cellular reception.

What Is Wi-Fi Calling?

Wi-Fi Calling allows compatible smartphones to route regular voice calls through a connected Wi-Fi network when cellular coverage is weak or unavailable.

It doesn't turn your phone into an internet-only calling device. You can generally use your normal phone number, and the person you're calling doesn't necessarily need Wi-Fi Calling enabled.

How Does It Work?

When Wi-Fi Calling is enabled, your phone can use an available Wi-Fi connection to connect with your mobile operator's network.

If the cellular signal is weak but the Wi-Fi connection is reliable, the phone can use Wi-Fi to carry the voice traffic.

Depending on the network and device, the phone may also switch between Wi-Fi and cellular connectivity as network conditions change.

How to Turn It On

The exact steps vary between Android phones and iPhones.

On many Android devices, you can look under:

Settings → SIMs/Mobile Network → Wi-Fi Calling

On an iPhone, the option is generally available under:

Settings → Mobile Service → Wi-Fi Calling

The wording and menu location can differ depending on the phone model, software version and mobile operator.

What Do You Need?

Wi-Fi Calling generally requires three things:

• A compatible smartphone

• A mobile operator that supports the feature

• A working Wi-Fi connection

Your SIM or mobile plan may also need to be eligible for Wi-Fi Calling.

If the option doesn't appear on your phone, check whether your carrier and device support the service.

Does Wi-Fi Calling Use Your Mobile Data?

When your phone is connected to Wi-Fi, Wi-Fi Calling uses the Wi-Fi network rather than your mobile data connection for the call.

However, your broadband connection still needs to be stable. A weak or congested Wi-Fi network can affect call quality.

For the best results, use a reliable Wi-Fi connection and stay within good range of the router.

Can You Make Emergency Calls?

Emergency calling capabilities can vary depending on the device, carrier and location.

Because emergency services need accurate location and network information, don't assume Wi-Fi Calling will work exactly like a normal cellular emergency call in every situation. Follow your carrier's instructions and local emergency-calling guidance.

Why Is This Feature Useful?

Wi-Fi Calling can be especially helpful in places where mobile signals struggle to penetrate walls.

It can improve calling reliability in homes, offices, shopping centres and other buildings where Wi-Fi coverage is much stronger than cellular reception.

One Simple Setting Can Make a Difference

If you regularly experience dropped calls despite having reliable home or office Wi-Fi, check whether your phone and mobile operator support Wi-Fi Calling.

Turning on the feature won't magically improve a poor Wi-Fi connection, but when your broadband is stable, it can provide a useful alternative to relying entirely on cellular signal strength.