How to Make Wi-Fi Calls: A Complete Guide from Setup to Diagnostics

Calls via Wi-Fi (or VoWiFi) is a technology that allows you to talk on the phone even without a cellular network, using an internet connection. It's especially useful in areas with poor mobile coverage: basements, remote villages, country houses, or even the subway (if there's Wi-Fi). But how does it work in practice? Is it enough to simply connect to the network, or do you need special settings?

In this article we will look at all stages — from checking the compatibility of your smartphone and plan to fine-tuning your router for a stable connection. You'll learn why calls sometimes drop and how to enable VoWiFi on iPhone And Android, and which operators will support the technology in 2026. Also, how to diagnose problems and what to do if the other person can't hear you.

Spoiler: Wi-Fi calls consume an average of 1–3 MB of data per minute, but don't consume minutes from your plan (unless your carrier blocks this feature).This makes the technology not only convenient, but also economical.

What is VoWiFi and how does it work?

VoWiFi (Voice over Wi-Fi) is a communications standard that redirects voice traffic from cell towers to an internet protocol. The technology is based on the protocol IMS (IP Multimedia Subsystem), which is also used for VoLTE (4G calls). The main difference: instead of a cellular network, the signal goes through your home or office Wi-Fi.

What this looks like in practice:

• 📶 Your phone is connected to Wi-Fi, but there is no cellular network or it is weak.
• 📞 You call as usual - dial the number and press the call button.
• 🌐 The call goes through the internet, not the operator's tower, but to the other person it looks like a regular mobile call.
• 🔄 If Wi-Fi drops during a call, modern smartphones will automatically switch to the cellular network (if available).

It is important to understand that VoWiFi is not the same as instant messengers (WhatsApp, Telegram, Viber). Messenger calls go through their own servers, and the other person needs to have the messenger installed. VoWiFi works like a regular phone: call any number, even if the other person has an old push-button phone.

Which phones and carriers support VoWiFi in 2026?

Not all smartphones and carriers support VoWiFi. Here are the current requirements:

⚠️ Note: Some operators may have VoWiFi disabled by default even on supported plans. For example, MTS sometimes requires sending a USSD request *111*469# To activate, please check your account or contact support for details.

If your carrier or phone model is not listed in the table, it does not mean that VoWiFi is not working. For example, Google Pixel And OnePlus Almost always support the technology, even if it's not officially listed. Check your device's settings—if there's a "Wi-Fi Calling" option, the feature is available.

Step-by-step VoWiFi setup on Android

The instructions may differ slightly depending on the phone manufacturer, but the general algorithm is as follows:

Insert a VoLTE-enabled SIM card (if required)

Connect to a stable Wi-Fi network

Open Settings → Network & Internet → SIM cards

Find the "Wi-Fi Calling" option.

Enable the feature and select "Wi-Fi Priority" or "Wi-Fi Only" mode.

Restart your phone (recommended)

Make a test call-->

Let's take a closer look at an example. Samsung Galaxy:

1. Open Settings → Connections → Mobile networks.
2. Select your SIM card (if you have more than one).
3. Tap on Wi-Fi calling.
4. Activate the switch and select the mode:
   • 📶 "Mobile network is preferable" — calls will be made via Wi-Fi only if there is no cellular network.
   • 🌐 "Wi-Fi is preferred" — the phone will try to make calls via the Internet even if 4G is available.
   • 🔒 Wi-Fi only — calls will be made exclusively via the Internet (useful when roaming).

Confirm emergency call address (may be required for services like 112).

On Xiaomi another way: Settings → SIM cards & mobile networks → [select SIM] → Wi-Fi callingIf the item is not present, it means your model does not support the function.

⚠️ Attention: On some firmware (for example, MIUI for the region India) VoWiFi may be unstable. If calls don't go through after enabling the feature, try changing your phone's region to Russia or Europe in the settings.

Setting up VoWiFi on iPhone (iOS)

On iPhone The process is simpler, but there are some nuances with the operators. Here's how to enable it:

1. Open Settings → Cellular.
2. Select Data Options → Wi-Fi Calling.
3. Activate the switch Wi-Fi calling on this iPhone.
4. Enable the option Allow calls on other devices, if you want to call from Mac or iPad.
5. Confirm yours emergency call address (required for the USA and Europe, may not be required in Russia).

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

• 🔄 Restart your phone.
• 📶 Temporarily disable and enable again Modem mode.
• 📞 Make an outgoing call - sometimes the indicator only appears during a call.

On iPhone there is one peculiarity: if you turned on Calls on other devices, then the incoming ones will be duplicated on Mac, iPad and even Apple WatchThis is convenient, but it can drain the battery of additional devices. It can be disabled in the same settings.

Router requirements for stable Wi-Fi calling

The quality of VoWiFi directly depends on your router. If the router is weak or improperly configured, calls will be dropped, and the other party will hear an echo or a robotic voice. Here are the key requirements:

• 📶 Wi-Fi standard: Minimum 802.11n (2.4 GHz), but better 802.11ac (5 GHz) or Wi-Fi 6There may be interference from neighbors at the 2.4 GHz frequency.
• 🔄 Channel and width: For 2.4 GHz, select channels 1, 6, or 11 (the least congested). The channel width is 20 MHz. For 5 GHz, any channel with a width of 40–80 MHz.
• 🔒 QoS (Quality of Service): Enable voice traffic prioritization in your router settings (the option may be called VoIP QoS or WMM).
• 📡 Signal strength: The signal level at the place of the call must not be lower than -65 dBm (checked by applications like Wi-Fi Analyzer).

If your router is older than 5 years, it likely won't handle stable VoWiFi calls. Here are the models that have been tested for compatibility:

• 🏆 ASUS RT-AX88U - the best choice for a large house (supports Wi-Fi 6 And QoS for VoIP).
• 💰 TP-Link Archer C6 — a budget option with good stability at 5 GHz.
• 🛡️ Keenetic Ultra - optimized for voice traffic, has a built-in SIP proxy.

⚠️ Note: If you have a dual-band router, force your phone to connect to the network 5 GHz. On frequency 2.4 GHz VoWiFi will perform worse due to interference and lower bandwidth.

How to check Wi-Fi signal strength

Open the app on Android Wi-Fi Analyzer (or NetSpot for iOS).

Look at the signal level graph. The green zone (above) -65 dBm) - excellent, yellow (-70 dBm) - acceptable, red (below -80 dBm) - calls will be disconnected.

If the signal is weak, move the router closer or use Wi-Fi repeater (mesh system).

Common problems and their solutions

Even with a properly configured VoWiFi connection, issues can still occur. Here are some common issues and how to fix them:

Problem	Possible cause	Solution
The call doesn't go through (error "Call not possible")	The operator does not support VoWiFi or the SIM card is old.	Call the operator's support and request a SIM replacement. USIM (for VoLTE/VoWiFi).
The other person hears an echo or a robotic voice.	Poor Wi-Fi quality or network congestion	Reconnect to the network 5 GHz, disconnect other devices from Wi-Fi, turn on QoS on the router.
The call disconnects after 10-30 seconds	The router is blocking SIP traffic or the session is being reset.	Disable it in your router settings. SIP ALG (in the section Firewall or NAT).
VoWiFi only works on your home network.	The operator is limiting the function for public Wi-Fi.	Try using a VPN or contact your carrier to unblock it.
The battery drains quickly when VoWiFi is enabled.	The phone is constantly scanning for networks	Turn it off Network search in the Wi-Fi settings or turn on the mode Wi-Fi only.

If none of the solutions help, try resetting the network settings on your phone:

• On Android: Settings → System → Reset → Reset Wi-Fi, mobile network, and Bluetooth settings.
• On iPhone: Settings → General → Transfer or reset iPhone → Reset → Reset Network Settings.

After the reset, you will have to reconnect to Wi-Fi and set up VoWiFi, but this often solves connection problems.

VoWiFi in Roaming: How to Call Abroad Free of Charges

One of the main features of VoWiFi is the ability to make calls from abroad at your home rate, avoiding roaming charges. But there are some caveats:

• ✈️ Operator support: Not all operators allow VoWiFi in roaming. For example, MTS And Beeline allow, and Megaphone may block.
• 🌍 Local restrictions: In some countries (for example, UAE, China) VoWiFi may be blocked at the provider level.
• 🔒 Safety: In public Wi-Fi (hotels, airports), it is better to use a VPN to protect voice traffic.

How to set up VoWiFi for roaming:

1. Before your trip, check whether your operator supports VoWiFi in roaming (information is available in your personal account or from support).
2. Turn on the mode on your phone Wi-Fi only (so that calls do not go through the local cellular network).
3. Connect to a reliable Wi-Fi network (for example, at a hotel or via a local SIM card with unlimited internet).
4. Make a test call to a short number (for example, 112) - if the connection is successful, everything is working.

⚠️ Please note: In some countries (e.g. Türkiye, Egypt) Local operators may block VoWiFi for foreign SIM cards. In this case, the only solution is to purchase a local SIM card or use messaging apps.

If VoWiFi doesn't work in roaming, an alternative is to make calls via WhatsApp, Telegram or Skype. But remember that in some countries (for example, UAE) these services can also be blocked without a VPN.

FAQ: Answers to Frequently Asked Questions

Is it possible to make calls over Wi-Fi without a SIM card?

No, VoWiFi requires an active SIM card with IMS support (as with VoLTE). Without a SIM card, Wi-Fi calls are only possible through messaging apps (WhatsApp, Viber, etc.).

Are Wi-Fi calls counted as outgoing calls according to the tariff?

It depends on the carrier. Most Russian providers (MTS, Beeline, MegaFon) don't charge minutes for VoWiFi calls, but some international carriers may charge them as regular calls. Check your account.

Why isn't VoWiFi working on my Xiaomi?

Most likely, your model is equipped with a chip MediaTek, which doesn't support IMS well. Try updating the firmware to the latest version or check if the "Wi-Fi Calling" option is enabled in the settings after resetting the network.

Can I use VoWiFi on a tablet?

Yes, but only if the tablet supports SIM cards and VoLTE/VoWiFi. For example, Samsung Galaxy Tab S8 or iPad Pro With an eSIM. VoWiFi won't work on Wi-Fi-only tablets.

How to disable VoWiFi if it interferes?

On Android: Settings → Network & Internet → SIM cards → Wi-Fi calling (turn off the switch). On iPhone: Settings → Cellular → Wi-Fi Calling.