How to Enable Wi-Fi Calling on Android: A Step-by-Step Guide with Troubleshooting

Calls via Wi-Fi Calling (or VoWiFi) allows you to talk on the phone even without a mobile network—all you need is a stable internet connection. This technology is especially useful in areas with poor cellular coverage, such as basements, country houses, or tall buildings where the carrier's signal is weak. But how do you activate this feature on your smartphone? Android and what nuances should be taken into account?

In this article you will find Unique data on VoWiFi support by Russian operators in 2026, step-by-step instructions for different manufacturers (from Samsung to Realme), as well as ways to diagnose problems if Wi-Fi calling isn't working. We'll explore why the feature might be hidden in settings, how to check your device's compatibility, and what to do if your carrier doesn't support the technology.

Important: Despite the technology's universality, its implementation depends on three factors: the phone model, firmware version, and operator tariff plan. Some brands (for example, Huawei) may use their own names for the feature, and individual operators may limit its availability to corporate clients.

What is VoWiFi and how does it work?

Technology Wi-Fi Calling (or Voice over Wi-Fi(VoWiFi, abbreviated as VoWiFi) allows voice calls to be made over the internet instead of traditional cellular networks. It's not the same as messaging apps like WhatsApp or Telegram — standard telephone communication is used here, but routing is done using the IP protocol.

Key benefits:

• 📶 Stable signal in places where cellular communication is absent or weak (for example, in the subway, basements, remote areas).
• 💰 Saving When roaming, many operators allow you to make calls via Wi-Fi abroad at domestic rates.
• 🔋 Less battery consumption compared to searching for a cellular network in poor coverage conditions.
• 📞 Smooth transition between Wi-Fi and LTE during a call (if the operator supports it) ePDG).

Technically, VoWiFi works through a protocol IMS (IP Multimedia Subsystem), which is integrated into modern 4G/5G networks. The call is first transmitted via Wi-Fi to the operator's server and then routed like a regular call. The difference is invisible to the subscriber—incoming and outgoing numbers are displayed in a standard format.

Requirements for VoWiFi on Android

Before setting up the feature, make sure your device and carrier meet the following key requirements:

Particular attention should be paid to operator supportAs of 2026, VoWiFi is officially available from most Russian providers, but there are some caveats:

• 📱 MTS, Beeline, Megaphone And Tele2 support technology for individuals on most tariffs.
• 🏢 Corporate clients may require additional activation through their personal account.
• 🌍 When roaming, VoWiFi often only works when connected to your "home" Wi-Fi (for example, in a hotel abroad).

⚠️ Attention: VoWiFi support details may vary depending on your region and plan. For more information, check the "Services" section of your operator account or contact support.

How to check if your phone supports VoWiFi

Not all smartphones Android are capable of working with VoWiFi, even if they were released after 2020. Here's how to find out if your device supports the technology:

Method 1: Checking through settings

Open your phone menu and follow these steps:

1. Go to Settings → Connections → Mobile network (on Samsung) or Settings → SIM cards and mobile networks (on Xiaomi/Realme).
2. Find the item Wi-Fi calling, VoWiFi or Wi-Fi Calling.
3. If the option appears, your device supports the feature. If not, check other methods.

Method 2: Check by phone model

Some manufacturers publish lists of supported devices. For example, Samsung VoWiFi works on all flagships since 2018 (starting from Galaxy S8), and Xiaomi - on models with a processor Snapdragon 8xx or Dimensity (For example, Redmi Note 11 Pro+, POCO F4).

For a quick check:

• 🔍 Enter your phone model + "VoWiFi support" in the search (for example, "Redmi Note 10 Pro VoWiFi support").
• 📄 Check the specifications on the manufacturer's official website (section "Network" or "Wireless Technologies").

How do I find out the exact model of my Android phone?

Open Settings → About phone → ModelIf the model is not listed, look on the device box or under the battery (for phones with a removable battery).

Method 3: Checking through the engineering menu

For advanced users: you can check support IMS via the engineering menu. To do this:

1. Open the app Telephone and enter the combination: ##4636##.
2. Go to the section Phone information.
3. Check the status VoWiFi or IMS RegistrationIf he Registered — the function is supported.

⚠️ Attention: The engineering menu may vary depending on the firmware version. Don't change any settings unless you're sure of their purpose, as this may cause network issues.

Step-by-step instructions: how to enable VoWiFi on Android

The activation process varies depending on the smartphone manufacturer. Below are instructions for the most popular brands.

For Samsung phones (One UI)

On devices Samsung with shell One UI (Android 10 and newer) You can enable VoWiFi like this:

1. Open Settings → Connections → Mobile network.
2. Select your SIM card (if you have more than one).
3. Tap on the item Wi-Fi calling.
4. Activate the switch and select the mode:
   • Wi-Fi is preferred — calls will go through the Internet, even if there is a cellular network.
   • Cellular network is preferred — Wi-Fi is used only when there is no coverage.

Confirm activation if prompted.

For Xiaomi, Redmi, and POCO (MIUI) phones

On smartphones with firmware MIUI 12 and newer:

1. Go to Settings → SIM cards and mobile networks.
2. Select your SIM card and tap Wi-Fi calling.
3. Enable the feature and accept the operator's terms and conditions (if prompted).
4. Restart your phone to apply the changes.

Make sure the "Wi-Fi Calling" icon (usually a phone icon with waves) appears in the status bar.

Try making a test call to a different number.

Make sure your VoWiFi connection is active in your call settings.

Turn off mobile data and try the call again - it should go through Wi-Fi-->

For Google Pixel and "pure" Android

On devices with stock Android (For example, Google Pixel, Nokia, Motorola):

1. Open Settings → Network & Internet → SIM cards.
2. Select SIM and go to Wi-Fi calling.
3. Activate the function and select the operating mode (similarly Samsung).

For Realme, Oppo, and Vivo phones (ColorOS/Funtouch OS)

The path may differ for these brands:

1. Go to Settings → Mobile network → Your SIM card name.
2. Find VoWiFi or Wi-Fi Calling and turn it on.
3. Confirm activation via SMS (if your operator requires confirmation).

If there is no item in the settings Wi-Fi Calling, but you are sure that the phone supports the function, try:

• 🔄 Update the firmware to the latest version.
• 📋 Insert the SIM card into another slot (if there are two).
• 📞 Contact your operator and request VoWiFi activation for your number.

What to do if VoWiFi isn't working

If you still can't make calls over Wi-Fi after setting up, please check the following:

1. Problems with the SIM card or operator

Not all SIM cards support VoWiFi, even if your phone is compatible. Possible reasons:

• 🆔 Outdated SIM card (e.g. not USIM or 4G LTE). Solution: replace the card at the operator's office.
• 📛 Your tariff plan doesn't support VoWiFi. Solution: Check the terms in your account or call support.
• 🔒 The operator is blocking the feature for corporate clients. Solution: Check with your manager.

2. Problems with the phone

If your operator supports VoWiFi, but calls are not processed:

• 📱 Update the firmware to the latest version (especially relevant for Xiaomi And Realme).
• 🔧 Reset network settings: Settings → System → Reset → Reset Mobile Network Settings.
• 📵 Check the airplane mode: Sometimes it blocks VoWiFi even when Wi-Fi is on.
• 🔄 Switch SIM card in another slot (if there are two).

3. Problems with the Wi-Fi network

Some routers or public networks block VoIP traffic. Try:

• 🌐 Connect to a different Wi-Fi network (for example, your home network instead of a public one).
• 🔒 Disable your VPN or proxy—they may interfere with the connection.
• 📡 Reboot your router (sometimes helps with failures) IMS).

If nothing helps, check the error log:

1. Enter in the phone app: ##4636##.
2. Go to Phone Information → IMS Service Status.
3. If the status Not Registered — the problem is on the operator or SIM card side.

⚠️ Attention: On some firmware (for example, custom ones), VoWiFi may not work due to missing certificates. IMSIn this case, only updating to the official version will help.

VoWiFi and roaming: how to call abroad at domestic rates

One of VoWiFi's key features is the ability to make calls over Wi-Fi while roaming at your home region's rates. However, there are some caveats:

✅ When it works:

• 🌍 You are connected to Wi-Fi in a country where your operator has partnership agreements (for example, in a hotel or cafe).
• 📡 Your plan supports "Wi-Fi Calling in roaming" (check with your operator).
• 📱 The phone is registered on the network IMS (checked through the engineering menu).

❌ When it doesn't work:

• 🚫 The operator blocks VoWiFi in certain countries (for example, due to local regulatory restrictions).
• 🔌 You are connected to mobile internet (not Wi-Fi), even if VoWiFi is enabled.
• 📵 Your SIM card is not linked to IMS- operator profile (solved by replacing the SIM card).

Example from practice: MTS In 2026, VoWiFi roaming works in 40+ countries, but requires connection to "trusted" Wi-Fi networks (for example, in partner hotels). MegaFon This function is only available for tariffs with the "Unlimited" option.

VoWiFi vs. VoLTE: What's the Difference and Which is Better?

Users often get confused VoWiFi And VoLTE (voice over 4G). Although both technologies use IMS, they solve different problems:

✅ When to use VoWiFi:

• 🏠 At home or in the office, where Wi-Fi is more stable than a cellular network.
• 🏔️ In places with poor coverage (mountains, basements, remote areas).
• ✈️ Save on calls while roaming.

✅ When to use VoLTE:

• 🚗 On the move (transmission between towers is smoother than between Wi-Fi points).
• 📶 In places with a good 4G/5G signal, but weak Wi-Fi.
• 🎤 For better sound quality (VoLTE supports codec HD Voice).

The ideal situation is when both standards are enabled simultaneously. Modern smartphones automatically select the optimal channel (Wi-Fi or 4G) depending on conditions.

FAQ: Frequently asked questions about VoWiFi on Android

My phone doesn't support VoWiFi. Are there any alternatives?

Yes, you can use instant messengers that support calls (WhatsApp, Telegram, Viber), but they require the other person to be on the same app. For standard calls, there's no alternative to VoWiFi—only cellular or VoLTE.

Why do calls sometimes go through the cellular network when VoWiFi is enabled?

This is normal behavior. The phone automatically selects the best channel: if Wi-Fi is weak or congested, the call may switch to 4G/3G. To force the use of Wi-Fi, select the "Wi-Fi is preferred".

Is it possible to use VoWiFi without a SIM card?

No, VoWiFi requires an active SIM card with support IMSThe function is tied to a phone number and operator, so it won't work without a SIM card or with an inactive card.

Will VoWiFi work with two SIM cards?

Yes, but usually only for one SIM card at a time. You can choose which card to activate the feature for in the settings. Some phones (e.g., Samsung Galaxy S23) support VoWiFi for both SIM cards, but this depends on the firmware.

How to disable VoWiFi if you don't need it?

Just go back to settings (Mobile network → VoWiFi) and disable the feature. This may be necessary if you notice issues with your battery or network connection.