Wi-Fi calling: when to turn it on

Wi-Fi calling lets your phone make and receive normal calls and texts over a Wi-Fi network instead of the mobile network. Turn it on if your home or office has weak mobile signal but good Wi-Fi. Leave it off, or set mobile as preferred, if your Wi-Fi is unreliable or you are on a crowded public network.

What is Wi-Fi calling?

Wi-Fi calling is a carrier feature built into most modern phones. When it is on and mobile signal is poor, your phone connects to your carrier through the internet and carries the call over Wi-Fi. Your number stays the same, you use the normal phone app, and the person you call does not need to do anything.

It is different from calling through a messaging app. With Wi-Fi calling, it is a normal phone call on your carrier's network. It just takes a different path to get there.

When to turn Wi-Fi calling on

• Weak signal at home or work. This is the main reason. If calls drop or break up indoors but your Wi-Fi is good, Wi-Fi calling often fixes it. See why signal is weak inside buildings and basements.
• Basements, offices and rural homes. Anywhere mobile coverage is poor but broadband is decent.
• Abroad, in some cases. Some carriers treat Wi-Fi calls abroad as if you were at home. Others do not, or do not allow Wi-Fi calling abroad at all. Check your carrier's terms before you rely on it.
• To keep calls going in a dead spot. Calls can stay up in rooms where mobile signal disappears.

When to leave it off or prefer mobile

• Your Wi-Fi is unreliable. If your home Wi-Fi drops often or has high jitter, calls will stutter. Fix the Wi-Fi first.
• Busy public networks. Café or hotel Wi-Fi may be slow or crowded. Calls can still work, but quality varies.
• Mobile signal is already strong. If you have good mobile signal, there is little to gain.
• Captive portal networks. Networks that need a login page may block the connection the phone needs until you sign in.

Many phones let you choose a preference, such as "Wi-Fi preferred" or "mobile preferred". If you move between strong and weak signal a lot, "mobile preferred" uses Wi-Fi only when needed.

How to turn on Wi-Fi calling

1. Check that your carrier and your plan support Wi-Fi calling. Most large carriers do, but not every plan or phone.
2. On most phones, open Settings and search for "Wi-Fi calling".
3. Turn it on.
4. Set your emergency address if asked. This is the address emergency services may use if you call them over Wi-Fi.
5. Choose a preference if your phone offers one.
6. Turn on Wi-Fi and connect to your network.
7. Look for a Wi-Fi calling icon or label in the status bar or the phone app. Its look varies by phone and carrier.

If you cannot find the setting, your carrier may not support it on your phone or plan. Contact them to check.

What your Wi-Fi needs for good calls

Voice calls use very little bandwidth, so you do not need a fast connection. What matters is stability:

• Low and steady ping.
• Low jitter, so the voice does not break up.
• No packet loss.
• A decent Wi-Fi signal where you take calls.

Our guide on whether your connection is good enough for video calls covers these numbers, and they apply to voice too. If your Wi-Fi is weaker in some rooms, the 5 GHz band gives a cleaner link near the router, while 2.4 GHz reaches further. See 2.4 GHz vs 5 GHz vs 6 GHz.

Is Wi-Fi calling secure?

Wi-Fi calls are carried through an encrypted connection between your phone and your carrier. That protects the call itself on public Wi-Fi. As always on public networks, keep other habits in mind, like not joining networks you do not recognise.

What happens when you walk out of Wi-Fi range?

On many phones and networks, a Wi-Fi call can be handed over to the mobile network as you leave. If mobile signal is very weak at that moment, the call may drop. If this keeps happening at the same doorway, take important calls inside, or see our guide on why calls drop.

How CellRadar helps

CellRadar shows your live mobile signal and Wi-Fi signal, so you can see which one is stronger where you take calls. The Wi-Fi Meter gives a live strength gauge to find a good spot, and the Game & Call Check tells you whether your connection is ready for calls. Its speed test shows ping and jitter, which matter more for calls than raw speed.

Frequently asked questions

Does Wi-Fi calling cost extra?

Many carriers include it at no extra cost for calls within your plan, but terms differ, especially abroad. Check your carrier's details.

Does Wi-Fi calling use mobile data?

No. It uses your Wi-Fi connection. If the phone hands the call over to the mobile network, it continues as a normal mobile call.

Can I call emergency services over Wi-Fi?

Usually yes, but location may rely on the emergency address you registered. Keep it up to date, and use mobile signal when it is available.

Why does my phone not show Wi-Fi calling?

Your carrier, plan or phone model may not support it, or the setting may be switched off. Search Settings for "Wi-Fi calling" and contact your carrier if it is missing.