How to Enable Voice over Wi-Fi (VoWiFi) on Your Phone: A Complete Guide with Router Setup

Technology Voice over Wi-Fi (VoWiFi) It allows you to make calls over a wireless network instead of a cellular connection, saving battery life and improving call quality in areas with poor coverage. This is especially useful in offices, basements, or country houses where cell phone signal is weak. But how do you properly enable VoWiFi on your smartphone and ensure that your carrier supports it?

Many users encounter activation issues: the icon doesn't appear, calls are dropped, or the operator blocks the feature. In this article— Step-by-step instructions for Android and iOS, checking operator compatibility, configuring your router for stable operation, and troubleshooting. And also, a chart of VoWiFi support across Russian and international operators for 2026.

Let's be clear: even if your phone supports VoWiFi, your carrier may limit the feature based on your plan or region. For example, MTS And Beeline VoWiFi is enabled only for subscribers with the active "Calling via Wi-Fi" service, and Tele2 — only in your home region. Check the terms in your personal account before setting up.

What is Voice over Wi-Fi and why is it needed?

VoWiFi (Voice over Wi-Fi) — is a communications standard that allows voice calls to be made over a wireless network instead of traditional cell towers. The technology operates on the basis of the protocol IMS (IP Multimedia Subsystem) and integrated into modern 4G/5G networks. The main advantage is Calls are not interrupted when switching between Wi-Fi and mobile networks (handover), if the operator supports ePDG (evolved Packet Data Network Gateway).

Why is this beneficial for the user:

• 📶 The best coverage: calls work even where the cellular signal is weak (basements, elevators, remote areas).
• 🔋 Battery saving: The phone does not waste energy searching for a cell tower if it is connected to Wi-Fi.
• 💰 Free calls: Operators often do not charge VoWiFi calls as internet traffic (but check the tariff conditions!).
• 🌍 Roaming without surcharges: Some operators allow you to make calls via Wi-Fi abroad at domestic rates.

The difference between VoWiFi and VoIP (For example, Skype or WhatsApp Calls): the first calls are made through the operator and appear as normal in the call log, while the second calls are made through third-party apps with a different number (or without one). VoWiFi also supports emergency calls (112, 911), whereas VoIP does not.

The technology is available on most smartphones with Android 9+ And iOS 12+, but there are nuances:

• ⚠️ On iPhone VoWiFi only works with SIM cards from operators that support it. eSIM or special profiles.
• ⚠️ On Android manual activation may be required in the engineering menu (for example, on Xiaomi or Realme).

Checking if your carrier supports VoWiFi

Before setting up your phone, make sure your carrier supports VoWiFi. As of 2026, most Russian and international providers offer this service, but often with plan or regional restrictions.

Current VoWiFi support table for popular operators:

How to check support for your plan:

1. Open the operator's personal account (website or application).
2. Find the "Services" or "Additional Options" section.
3. Look for items like "Wi-Fi Calling", "VoWiFi", "Wi-Fi Calling".
4. If this option is not available, please call support and check if it is available for your number.

⚠️ Attention: Some operators (eg. Tele2) can enable VoWiFi only after replacing the SIM card with a new one that supports it. IMS profileOld SIM cards (manufactured before 2020) are often not compatible.

If your carrier supports VoWiFi but it's not working, the issue may be with your phone or router settings. More on this in the following sections.

How to Enable VoWiFi on Android: Step-by-Step Instructions

On most smartphones with Android 9 and later Enabling VoWiFi takes several steps. The interface may differ depending on the shell (MIUI, One UI, ColorOS etc.), but the general algorithm is the same.

Universal instructions:

1. Open Settings → Connections → Mobile network (or SIM cards and mobile networks).
2. Select your SIM card (if your phone has dual SIM).
3. Find the item Wi-Fi Calling or "VoWiFi".
4. Activate the switch. SMS confirmation may be required.
5. Restart your phone.

If the item is not in the menu, try alternative methods:

Check for phone software updates|Make sure your SIM card supports IMS|Activate VoLTE (if disabled)|Reset network settings (Settings → System → Reset → Reset Mobile Network)|Contact your operator's support-->

For phones Xiaomi/Redmi/POCO an additional step may be required:

1. Enter the code in the phone app: ##869434##.
2. In the menu that opens, select VoWiFi Settings.
3. Enable the option Wi-Fi Calling Provisioning.
4. Restart your device.

On Samsung Galaxy (shell One UI) the path may look like this: Settings → Connections → Mobile networks → Advanced → Wi-Fi calling.

⚠️ Attention: On some models Huawei And Honor VoWiFi is blocked due to a lack of Google Mobile Services (GMS) certification. In this case, the only solution is to update the firmware to the international version.

Once activated, an icon should appear in the status bar. "VoWiFi" or "Wi-Fi Calling"If it's not there, but the feature is enabled, try making a test call over Wi-Fi (turn off your mobile network to check).

How can I check if a call is made via Wi-Fi?

During a call, look at the network indicator in the top bar. If you see a Wi-Fi icon instead of (or next to) the cellular antennas, the call is being made via VoWiFi. You can also turn off mobile data and try calling—if a connection is established, VoWiFi is working.

Setting up VoWiFi on iPhone (iOS 12 and later)

On iPhone The process of enabling VoWiFi is simpler, but there are nuances with operator support. The feature is available on models iPhone 6s and newer with iOS 12+.

Step-by-step instructions:

1. Go to Settings → Cellular.
2. Select your SIM card (if you have more than one).
3. Click Wi-Fi Calling.
4. Activate the switch Wi-Fi calling on this iPhone.
5. In the window that appears, confirm your emergency address (usually your home address is automatically filled in).

If the option is inactive (grayed out), the reasons may be as follows:

• 📱 Your operator does not support VoWiFi for iPhone (check with support).
• 🔄 The SIM card is not compatible with eSIM or IMS profile.
• 📡 No Wi-Fi connection (yes, this is required for activation!).
• 🔄 The iPhone does not have the latest iOS updates installed.

On iPhone With two SIM cards, VoWiFi can only work on one of them. To select the priority:

1. Go to Settings → Cellular → Wi-Fi Calling.
2. In the section Wi-Fi Calling Select the desired SIM card.

After activation, the following message will appear in the status bar: "Wi-Fi" next to your operator name. If it's not there, but the feature is enabled, try:

1. Turn the mode off and on again Airplane mode.
2. Reconnect to Wi-Fi.
3. Update operator settings: Settings → General → About → Carrier settings.

Configuring a router for stable VoWiFi operation

Even if your phone and carrier support VoWiFi, connection issues can still be caused by incorrect router settings. To ensure stable Wi-Fi calling, you must:

Minimum router requirements:

• 📶 Standard support 802.11ac (Wi-Fi 5) or newer.
• 🔄 No restrictions on UDP port 500 And 4500 (used for IPSec).
• 🔒 Disabled firewall for VoWiFi traffic (or adding exceptions).
• 🌐 Support IPv6 (optional, but improves stability).

Recommended router settings:

If VoWiFi calls are dropping or the audio is delayed, try:

1. Switch from 5 GHz to 2.4 GHz (or vice versa).
2. Disable Band Steering (automatic switching between frequencies).
3. Set manually static channel Wi-Fi (eg 36 or 48 for 5 GHz).
4. Disable IPv6, if the operator does not support it.

⚠️ Attention: Some public Wi-Fi networks (in cafes and airports) block UDP traffic required for VoWiFi. In this case, calls may not go through even if the icon "VoWiFi" active.

For advanced users: if the router supports VLAN, you can isolate VoWiFi traffic to a separate, high-priority network. This is useful for office networks with a large number of devices.

Common VoWiFi Problems and Their Solutions

Even after properly setting up VoWiFi, issues may still occur. Let's look at the most common errors and how to fix them.

Problem 1: There is a VoWiFi icon, but calls don't go through.

• 🔹 Check if your phone is connected to Wi-Fi (sometimes the icon remains even after disconnecting).
• 🔹 Make sure your mobile network is not disabled (VoWiFi works in parallel with it).
• 🔹 Restart your router and phone.
• 🔹 Update your operator profile (on Android: ##869434##, on iPhone: see above).

Problem 2: Calls are disconnected or the sound is interrupted

• 🔹 Check your Wi-Fi speed: 1 Mbps is enough for VoWiFi, but stability is more important.
• 🔹 Turn it off traffic saving in the Wi-Fi settings.
• 🔹 If you use VPN, disable it - it may block IMS traffic.
• 🔹 Turn on the router QoS and set high priority for UDP port 500.

Problem 3: VoWiFi won't turn on on my dual SIM phone.

• 🔹 Check if your operator supports VoWiFi on the second SIM (often it only works on SIM1).
• 🔹 On Android try changing the SIM card slot (move the main SIM to slot 1).
• 🔹 On iPhone In the VoWiFi settings, select the desired SIM manually.

Problem 4: The operator does not support VoWiFi.

• 🔹 Check with support whether the service can be activated via a USSD command (for example, *111*123# For MTS).
• 🔹 Try replacing the SIM card with a new one (with support) IMS).
• 🔹 If nothing helps, consider alternatives: WhatsApp Calls, Telegram calls or Google Voice.

Problem 5: VoWiFi works, but the caller ID is not transmitted (the number is not displayed)

• 🔹 This is a carrier limitation. Check if the "Number Transfer" service is enabled in your account.
• 🔹 On Android try resetting network settings: Settings → System → Reset → Reset Mobile Network.

VoWiFi Alternatives: When Standard Functionality Isn't Available

If your carrier or phone doesn't support VoWiFi, there are several alternative ways to make calls over Wi-Fi:

Comparison of alternatives:

If you need a full-fledged VoWiFi replacement that transmits your real number, consider services like Google Voice (for the USA) or Truphone (international numbers). For free calls within the country, WhatsApp or Telegram, but keep in mind that:

• 🔹 Your number will not be displayed to the recipient (or will be displayed as "WhatsApp").
• 🔹 Calls will not be recorded in the standard phone app log.
• 🔹 Emergency calls (112, 911) via VoIP don't work.

For business users, a good solution would be cloud PBXs with Wi-Fi Calling support, such as:

• 📞 Zoom Phone — integration with video conferencing, call recording.
• 📞 RingCentral — virtual numbers in 100+ countries.
• 📞 3CX — self-deploying IP PBX for offices.

⚠️ Attention: When using VoIP apps to make calls over Wi-Fi, your operator may charge them as data traffic. Check the terms in your personal account to avoid unexpected charges.

FAQ: Frequently asked questions about Voice over Wi-Fi

Is it possible to use VoWiFi without a SIM card?

No, VoWiFi is tied to your SIM card and carrier. Without it, you can only make calls through VoIP apps (WhatsApp, Skype, etc.), but these won't be standard calls.

Why doesn't VoWiFi work when roaming?

Most operators disable VoWiFi when roaming due to technical limitations or pricing policies. The exception is some plans with the "Wi-Fi Calling Abroad" option (for example, MTS or MegaFon). Check the terms and conditions in your personal account.

How to disable VoWiFi if it interferes?

On Android: Settings → Mobile Network → Wi-Fi Calling (turn off the switch). On iPhone: Settings → Cellular → Wi-Fi Calling.

If the option is inactive, try disabling it. VoLTE - sometimes this automatically deactivates VoWiFi.

Is it possible to make calls via VoWiFi from a laptop or tablet?

Yes, but only if the device supports it. eSIM with VoWiFi (for example, iPad Pro or Surface Pro with a cellular connection). An alternative is to use apps like Continuity on Mac for calls from iPhone via Wi-Fi.

Do VoWiFi calls affect internet quality for other devices?

Minimal. VoWiFi uses about 80–100 kbps for calls, which is comparable to streaming audio. However, if the network is congested, it is better to turn on QoS on the router and set priority for voice traffic.