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

Wi-Fi calling (VoWiFi) is a technology that allows you to make voice calls even without a mobile network, using an internet connection. This is especially useful in areas with poor 4G/5G coverage, such as basements, country houses, or tall buildings where the carrier's signal is unstable. But how do you activate this feature on your smartphone? Android and what nuances are important to take into account?

In this article you will find detailed instructions for different manufacturers (Samsung, Xiaomi, Google Pixel, Huawei (and others), a comparative table of VoWiFi support across Russian operators, as well as solutions to common issues—from missing options in settings to network registration errors. We'll also discuss how to check if the technology works on your device and what to do if your operator doesn't support Wi-Fi calling.

Spoiler: for most modern smartphones the process takes no more than 5 minutes, but there is hidden settings, which are not mentioned in the official manuals. For example, on some devices Xiaomi the option is hidden in the engineering menu, and Samsung Its operation depends on the firmware version.

What is VoWiFi and how does it work?

Technology Voice over Wi-Fi (VoWiFi) allows voice traffic to be transmitted over the internet instead of traditional mobile networks (GSM/UMTS/LTE). This is not the same as messengers like WhatsApp or Telegram — the standard is used here IMS (IP Multimedia Subsystem), integrated into the operator's network. Benefits:

• 📶 Stable signal in places where the mobile network is weak or absent (for example, in the metro or in rural areas).
• 🔄 Smooth transition between Wi-Fi and 4G/5G during a call (if the operator supports it) eSRVCC).
• 💰 Battery saving: the phone does not waste energy searching for a mobile network.
• 🔒 Security: traffic is encrypted at the operator level, unlike instant messengers.

It is important to understand that VoWiFi is not a replacement mobile communications, but rather a supplement to them. If Wi-Fi is disconnected during a call, the call may be dropped (unless automatic downgrade to LTE is supported). The technology also requires:

• ✅ Compatible smartphone (list below).
• ✅ Operator support (not all Russian providers provide VoWiFi).
• ✅ Stable Wi-Fi connection (preferably 5 GHz for best quality).

Which smartphones and carriers support VoWiFi?

Not all devices and operators support VoWiFi. Below is the current compatibility table for Russia (data may vary depending on region and firmware version).

If your model isn't on the list, it doesn't mean VoWiFi isn't supported. For example, some devices Honor or Nokia are also compatible, but require manual configuration. To check support:

1. Open Settings → SIM cards & mobile networks → [your SIM] → Wi-Fi Calling.
2. If there is no option, try entering ##4636## and find the tab IMS Status.
3. Check with your operator: send a USSD request *111*0887# (for MTS) or check in your personal account.

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

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

📱 For smartphones Samsung (One UI)

On devices Samsung with shell One UI (Galaxy S/A/Note/Fold series) the easiest way to enable VoWiFi is:

1. Go to Settings → Connections → SIM cards and mobile networks.
2. Select your SIM card (if you have more than one).
3. Tap on Wi-Fi calling and move the slider to the position On.
4. In the window that appears, select Wi-Fi only (if you want to call only via the Internet) or Wi-Fi is preferred (automatic network selection).

If there is no option:

• 🔄 Update your firmware to the latest version (Settings → Software Update).
• 📋 Check if your operator supports VoWiFi (list above).
• 🛠️ Reset network settings: Settings → General Management → Reset → Reset Network Settings.

📱 For smartphones Xiaomi (MIUI)

On Xiaomi The path to the settings may differ depending on the version MIUITry both options:

Method 1 (official):

1. Open Settings → SIM cards and mobile networks.
2. Select your SIM card.
3. Tap on Wi-Fi calling and activate the function.

Method 2 (if there is no option):

1. Enter in the dialer ##4636##.
2. Go to the tab Phone information.
3. Scroll down to the block Wi-Fi Calling and turn on the switch.
4. Restart your phone.

Connected to Wi-Fi|SIM card active|Firmware updated|Operator supports VoWiFi-->

📱 For Google Pixel and "pure" Android

On smartphones with stock Android (Pixel, Motorola, Nokia) the standard path:

1. Go to Settings → Network & Internet → SIM cards.
2. Select your SIM card.
3. Tap on Wi-Fi calling and turn on the function.
4. In the section Emergency address Please provide your physical address (required for emergency calls).

If the option is inactive:

• 🔧 Check your settings APN: path Settings → Network & Internet → Mobile network → Advanced → Access point names (APN). Make sure the operator profile is selected.
• 📡 Switch to a different Wi-Fi network (sometimes corporate networks block VoWiFi).

📱 For other brands (Huawei, OnePlus, Realme)

The path may vary on devices from these manufacturers. The general algorithm is:

1. Open Settings → Mobile network (or SIM cards and mobile networks).
2. Select a SIM card.
3. Look for options like Wi-Fi Calling, Calls via Wi-Fi or Volte/Wi-Fi Call.
4. If the option is not available, update the firmware or contact your carrier's support.

How to check if VoWiFi is working

Enabling the feature is half the battle. You need to make sure that calls are actually made over Wi-Fi and not your mobile network. Here's 4 ways to check:

1. Indicator in the status bar:

   During a call, an icon should appear in the top bar. Wi-Fi with a pipe (📞) or an inscription VoWiFiOn . Samsung it could be an icon Wi-Fi Call.

2. USSD request:

   Dial ##4636##, go to the tab IMS Status and check the status VoWiFi — it should be Registered.

3. Test call:

   Turn off mobile data and LTE (leave Wi-Fi on) and call another number. If the call goes through, VoWiFi is working.

4. Operator application:

   In your personal account MTS, Beeline or Megaphone Sometimes the VoWiFi status for your number is displayed.

If the call does not go through, but the VoWiFi indicator is on:

• 🔌 Check if your phone is blocking calls router (disable the firewall or restart it).
• 📵 Make sure that the mode is not activated on your phone On the plane or Do not disturb.
• 🔄 Try connecting to a different Wi-Fi network (for example, from 2.4 GHz to 5 GHz).

What should I do if VoWiFi connects but the sound is interrupted?

This is a common issue with a weak Wi-Fi signal or a congested network. Try:

1. Reconnect to the router at a frequency of 5 GHz (less interference).

2. Disable other devices that consume traffic (torrents, streaming).

3. Manually specify DNS (for example, 8.8.8.8) in the Wi-Fi settings.

4. If the problem persists, contact your operator: they may have bandwidth limitations for VoWiFi.

Common problems and their solutions

Even if everything is configured correctly, VoWiFi may not work. Let's take a look. the most common mistakes and ways to eliminate them.

❌ The "Wi-Fi Calling" option is missing from the settings

Reasons and solutions:

• 📱 Outdated firmware: Update your phone software to the latest version.
• 📡 The operator does not support VoWiFi.: check the list above or contact support (USSD: *111*0887# for MTS).
• 🔧 Hidden setting: try the engineering menu (##4636##) or applications like Network Signal Guru.
• 🛠️ Hardware limitations: some budget models (for example, Redmi 9A) do not support VoWiFi.

❌ VoWiFi turns on, but calls don't go through

Possible reasons:

• 🔌 Blocked by router: disable the firewall, check the settings QoS (traffic priority).
• 📵 Incorrect APN settings: reset them to default (or ask your operator).
• 🔄 Problems with IMS: Restart your phone or reset network settings.
• 📶 Weak Wi-Fi signal: Move closer to the router or switch to 5 GHz.

❌ Calls drop when switching between Wi-Fi and 4G

This happens if the operator does not support eSRVCC (smooth transition between networks). Solutions:

• 📞 In the VoWiFi settings, select Wi-Fi only (without automatic switching).
• 🔄 Disable VoLTE (if enabled), as conflict between VoLTE and VoWiFi can cause disconnections.
• 📡 Use a Mesh Wi-Fi system (e.g. TP-Link Deco) for stable coverage throughout the home.

❌ Error: "Failed to register with the IMS network"

This error means your phone can't connect to your carrier's VoWiFi server. Try:

1. Restart your phone.
2. Remove and re-add the SIM card in settings.
3. Reset network settings (Settings → System → Reset → Reset Wi-Fi, mobile networks, and Bluetooth).
4. Update your firmware or contact your carrier—they may be experiencing temporary issues.

Why might operators block VoWiFi?

Some providers limit VoWiFi for:

1. Traffic control (calls via Wi-Fi are more difficult to charge).

2. Prevent fraud (attackers can mask their location).

3. Technical limitations (not all base stations support IMS).

If your operator refuses to activate VoWiFi, try using alternative solutions, such as: Google Voice or Zoiper with a SIP account.

VoWiFi vs. VoLTE vs. Messengers: Which is Better?

Wi-Fi calling isn't the only way to communicate without a mobile network. Let's compare technologies:

When to use VoWiFi:

• 🏠 At home or at work, where Wi-Fi is more stable than a mobile network.
• 🚇 In the metro, basements, where there is no 4G coverage.
• 🌍 While roaming (if your operator doesn't block VoWiFi abroad).

When is it better to choose alternatives:

• 📵 If the operator does not support VoWiFi, but there is VoLTE.
• 💬 If you need not only calls, but also messages (then instant messengers are more convenient).
• 🔒 If privacy is important (encrypted SIP is more secure than VoWiFi).

Security and privacy when making Wi-Fi calls

VoWiFi encrypts traffic at the operator level, but this doesn't make the technology completely anonymous. Important points:

• 🔐 Encryption: voice traffic is protected by the protocol SRTP, but metadata (number, call time) can be stored by the operator.
• 📍 Geolocation: When making emergency calls (112), your address is transmitted to the rescue services even if the GPS is turned off.
• 🕵️ Traffic interception: theoretically possible at the router level (use strong passwords for Wi-Fi).
• 📵 Blocking: Some corporate networks may limit VoWiFi (e.g. in offices or hotels).

How to improve security:

1. Use VPN (but this may degrade the quality of the connection).
2. Turn off VoWiFi in public networks (cafes, airports).
3. Check what permissions your operator's app requests (if required for VoWiFi).

FAQ: Answers to frequently asked questions

❓ Is it possible to use VoWiFi without a SIM card?

No, VoWiFi requires an active SIM card from a carrier that supports the technology. Without a SIM card, Wi-Fi calls are only possible via messaging apps or SIP.

❓ Why doesn't VoWiFi work when roaming?

Many operators block VoWiFi abroad due to agreements with local providers. Check with your operator or use a local SIM card.

❓ Is it possible to make calls over Wi-Fi with two SIM cards?

Yes, but only if both SIM cards support VoWiFi and the phone allows it (for example, on Samsung Galaxy S23 You can choose for which SIM to enable the function).

❓ Does VoWiFi affect internet speed?

A VoWiFi call consumes approximately 1 Mbps, which is negligible for modern networks. However, if you have a slow internet connection (e.g., 10 Mbps), you may experience delays.

❓ How do I disable VoWiFi?

Go to your SIM card settings and disable the option. Wi-Fi callingOn some phones, you can only disable it for a specific Wi-Fi network.

If your question is not covered in the article, check official operator instructions or contact your smartphone's support team. Please note that some models (for example, budget ones) Realme or Tecno) may not support VoWiFi even with updated firmware - this is a hardware limitation.