How to Set Up Wi-Fi Calling on Android 10: A Complete Guide with Troubleshooting

Technology VoWiFi (Voice over Wi-Fi) allows you to make calls over a wireless network instead of a mobile connection. Android 10 This feature has become available to most users, but its setup often raises questions. Why don't carriers always activate VoWiFi automatically? It depends on the smartphone model, firmware version, and data plan. For example, Samsung Galaxy S10 or Google Pixel 3 support the technology out of the box, while budget devices may require manual configuration.

Many people mistakenly believe that VoWiFi requires a special plan or additional fees. In fact, most modern operators (MTS, Beeline, Megafon, Tele2) provide this service free of charge with a compatible device. The main requirement is a stable Wi-Fi connection with a speed of 1 MbpsIf your smartphone supports IMS (IP Multimedia Subsystem), then all you have to do is enable the feature in the settings. But here's where things get tricky: the menu interface can differ even on the same Android version.

In this article we will discuss:

• 🔍 How to check your smartphone's compatibility with VoWiFi
• ⚙️ Step-by-step setup on stock Android 10 and custom skins (Samsung One UI, Xiaomi MIUI)
• 📡 Working with different operators (including regional ones)
• ⚠️ Common errors and how to fix them (no menu option, calls not working)

1. Checking the compatibility of the device and operator

Before setting up VoWiFi, make sure your smartphone and SIM card support the technology. Key requirements:

• 📱 Smartphone: must support IMS and work on Android 9+ (but for stable operation it is recommended Android 10+). The list of compatible models is available on the operators' websites.
• 📶 Operator: The service must be activated for your plan. Check this in your personal account or via a USSD command (e.g., *111*59# for Beeline).
• 🌐 Wi-Fi network: must have unrestricted internet access (for example, corporate networks with portal authorization may block VoWiFi).

To check hardware support, enter the code in the phone app:

##4636##

In the menu that opens, select Phone information and find the line VoWiFi provisionedIf it's there 1 — your device is ready for setup. If 0 or the line is missing - the function is not supported at the hardware level.

Important: Some manufacturers (eg. Xiaomi or Huawei) block VoWiFi on devices for the Russian market due to firmware issues. In this case, only updating to the global firmware version will help.

How to find out the firmware version?

Open Settings → About phone → MIUI version (for Xiaomi) or EMUI version (for Huawei). If there is a '' at the end of the name RU, this is a Russian firmware with limitations.

2. Enable VoWiFi in Android 10 settings

The menu interface may differ depending on the shell, but the general algorithm is as follows:

1. Open Settings → Network and Internet (or Connections on Samsung).
2. Select Mobile network → Additionally (or Network mode).
3. Find the option Calls via Wi-Fi (Wi-Fi Calling) and activate it.
4. Select operating mode:
   • 📞 Wi-Fi only — calls will only go through the Internet (useful in areas without network coverage).
   • 🔄 Wi-Fi is preferred — the system will select the best channel itself.
   • 📡 Mobile network is preferred — VoWiFi will only be used when there is no signal.

On devices Samsung the path may look like this: Settings → Connections → Mobile networks → Wi-Fi callingOnce activated, the system will request your emergency call address (E911). Please provide your actual home address, as the dispatcher will use this information when calling emergency services.

Update your firmware to the latest version|

Connect to a stable Wi-Fi network|

Make sure your SIM card is activated and not blocked|

Check your account balance (some plans require a positive balance) -->

3. Configuration features for different operators

Although VoWiFi technology is standardized, operators can make their own adjustments. Let's look at the nuances for the four largest providers:

For Yota And Tinkoff Mobile VoWiFi is only available on a limited list of devices. For example, Yota officially supports the technology only on iPhone and flagship Samsung/Google PixelBefore setting up, please check the information in your operator account.

4. Solving common VoWiFi problems

Even after proper setup, users still encounter errors. Here are the most common ones and how to fix them:

⚠️ Attention: If you don't see the "Wi-Fi Calling" option in your settings, it may mean your carrier doesn't support the technology in your region. For example, Megaphone restricts VoWiFi in Crimea and Sevastopol.

• 🔴 The VoWiFi option is inactive (gray switch)
  

  Reasons:

  • The SIM card does not support IMS (try inserting a card from a different operator).
  • The device is disabled VoLTE (enable it in mobile network settings).
  • Custom firmware without IMS certificates installed.
• 📵 Calls don't go through even though VoWiFi is enabled.
  

  Solutions:

  • Restart your smartphone and router.
  • Disable your VPN or proxy—they may be blocking IMS traffic.
  • Check if your router has a restriction on outgoing UDP packets (port 500).
• 🔄 Calls constantly switch between Wi-Fi and mobile network
  

  This is normal behavior if selected. Wi-Fi is preferredTo lock a channel, select the mode Wi-Fi only in VoWiFi settings.

If the problem persists, try resetting your network settings: Settings → System → Reset → Reset Wi-Fi, mobile network, and Bluetooth settingsAfter this, you will have to re-enter your Wi-Fi passwords and pair with Bluetooth devices.

5. Checking connection quality and VoWiFi testing

To ensure that calls are actually made over Wi-Fi and not your mobile network, follow these steps:

1. Turn on VoWiFi and connect to Wi-Fi.
2. Turn off mobile data and put your phone in airplane mode, leaving only Wi-Fi on.
3. Call another number. If the call goes through, VoWiFi is working.
4. Check the indicator in the status bar: an icon should appear Wi-Fi with a handset (📞 above the Wi-Fi icon).

To assess the quality of the connection, use the application Network Signal Guru (available in Google Play). It shows:

• 📊 Wi-Fi signal strength (RSSI). Optimal value: above -60 dBm.
• 🕒 Delay (Ping). For VoWiFi, up to 100 ms.
• 📉 Packet loss. If more 1% — the network is overloaded.

Speed ​​test can be carried out through Speedtest or Youtube (start the video in 1080p). If the speed is lower 1 Mbps, VoWiFi will work with interference. In this case:

• Reconnect to the router at a frequency 5 GHz (less interference).
• Reduce the number of devices connected to Wi-Fi.
• Check if your router has a speed limit for your MAC address.

6. Alternative ways to make calls via Wi-Fi

If your carrier or device does not support VoWiFi, you can use alternative solutions:

• 📱 VoIP calling apps:
  • WhatsApp, Telegram, Viber — free calls between users of these messengers.
  • Skype or Zoom — for calls to landline and mobile numbers (chargeable).
  • Google Duo — optimized for weak networks, supports video calls.
• 🔄 Call forwarding:
  • Set up call forwarding to IP telephony (for example, via Zadarma or Sipnet).
  • Use the "Virtual PBX" service from your operator (for example, MTS Connect).
• 📡 Local solutions:
  • Connect Wi-Fi router with 3G/4G support (For example, Huawei B525) and use it as a signal repeater.
  • Set up SIP client on a smartphone (applications Linphone or Bria).

Each method has its limitations:

• VoIP applications require that the other party is also registered with the service.
• Call forwarding may incur a fee (for example, Beeline charges 3₽/min for call forwarding).
• On-premises SIP solutions are complex to set up and may not support emergency calling.

⚠️ Attention: When using third-party VoIP applications to call mobile/landline numbers, the operator may block such calls, considering them as tariff bypass. For example, Megaphone restricts outgoing calls through WhatsApp on some tariffs.

7. Router optimization for stable VoWiFi operation

VoWiFi quality depends not only on your smartphone but also on your router settings. Here are the key parameters to check:

• 🔒 Encryption type: use WPA2-AES or WPA3. WPA-TKIP And WEP not compatible with VoWiFi.
• 📶 Wi-Fi channel:
  • On frequency 2.4 GHz select a channel 1, 6 or 11 (less interference).
  • On 5 GHz use channels 36-48 or 149-165 (DFC-range).
• 🔄 QoS (Quality of Service): Enable voice traffic prioritization. Find the "Voice traffic prioritization" section in your router settings. QoS and add a rule for UDP port 500 (IMS).
• 🔌 MTU: set value 1472 (standard 1500 may cause packet fragmentation).

For routers TP-Link path to QoS settings: Advanced settings → QoS → Rule settings.

Add a new rule with parameters:

• Protocol: UDP
• Port: 500
• Priority: High

If you have a dual-band router, it is better to use the network for VoWiFi 5 GHz — it's less congested and provides a more stable connection. However, keep in mind that the range 5 GHz less than 2.4 GHz, so in larger rooms it may be necessary to install a repeater (repeater).

FAQ: Frequently asked questions about VoWiFi on Android 10

❓ Is it possible to use VoWiFi abroad without roaming?

Yes, but with nuances:

• If you are connected to a local Wi-Fi network, calls will be charged as outgoing calls from a Russian number (at domestic rates).
• Some operators (eg. Megaphone) support VoWiFi roaming — Wi-Fi calls in other countries are considered local.
• Check your plan's terms: some plans (such as MTS's "Perelet") may block VoWiFi while roaming.

Tip: Before your trip, check with your operator about VoWiFi support in roaming via chat or USSD command.

❓ Why does VoWiFi only work in some apps (like WhatsApp)?

These are two different technologies:

• VoWiFi (or Wi-Fi Calling) is a standard mobile network feature integrated into the phone app. It replaces regular phone calls while preserving your caller ID number.
• VoIP in messengers — is internet telephony that operates through application servers (WhatsApp, Viber, etc.). It uses an account number, not a SIM card.

If VoWiFi doesn't work in the standard phone app, but works in WhatsApp, the problem is most likely in the operator or smartphone settings (see Section 4).

❓ How do I disable VoWiFi if it's interfering?

To deactivate the feature:

1. Go to Settings → Network & Internet → Mobile network → Wi-Fi calling.
2. Move the switch to the position Off.
3. If the option is missing, disable it. VoLTE - this automatically deactivates VoWiFi.

On some devices (eg. Samsung) You may need to reset your network settings: Settings → General Management → Reset → Reset Network Settings.

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

No, this is not possible. VoWiFi technology is tied to a SIM card and a mobile operator. It doesn't replace, but rather complements, your regular mobile network. Without a SIM card, you can only make calls through third-party VoIP apps (WhatsApp, Skype, etc.), not through the standard phone app.

Exception: some operators (eg. Google Fi (In the US) allow the use of VoWiFi on devices without a physical SIM card, but such services are not yet available in Russia.

❓ Why doesn't VoWiFi work with two SIM cards?

On most Dual SIM smartphones, VoWiFi support is only available for primary SIM card (slot 1). This is a firmware limitation. To activate VoWiFi for the second SIM:

• Swap the SIM cards (move the desired card to slot 1).
• Check if your smartphone supports it Dual VoLTE/VoWiFi (For example, Samsung Galaxy S20+ or OnePlus 8 Pro).
• Update your firmware - newer versions of Android (11+) have improved dual SIM support for VoWiFi.

On devices Xiaomi And Realme A common issue is that VoWiFi only works on one SIM card, even with the same carrier. This is due to hardware limitations of the chip. Modem.