Modern mobile communications require stable coverage, but in reality, users often encounter "dead zones" inside buildings. VoWiFi Voice over Wi-Fi (Voice over Wi-Fi) is a technology that allows you to make and receive voice calls over a Wi-Fi network, using the internet connection instead of a cell tower. For MegaFon subscribers, this means they can make calls even in areas where their phone displays "no service" but where a wireless router is available.
Activating this feature doesn't require installing third-party apps like Skype or WhatsApp, as calls are made from your regular number and are charged according to your minute plan. However, the activation process may vary depending on your smartphone model and operating system version. In this article, we'll cover all the setup details, potential errors, and how the technology works on devices from different manufacturers.
Before setting up, make sure your plan supports this feature, as some legacy plans may require a prior update to their terms of service. It's also important to ensure your device has the latest firmware version, as VoWiFi support is being added gradually by carriers and phone manufacturers. If you're roaming abroad, using Wi-Fi Calling can significantly reduce your call costs.
Checking device and tariff compatibility
The first step before attempting to activate the service is to verify the technical capabilities of your equipment. Not all smartphones, even modern ones, have built-in support for the IMS protocol required for VoWiFi. MegaFon maintains a constant list of certified devices, and having a 4G modem in your phone doesn't guarantee voice calls over Wi-Fi.
It is important to understand the difference between Wi-Fi Calling and regular calls via messengers. In the former case, you call using your phone's standard dialer, and the other person sees your number, while in the latter case, you need the app and a contact in your address book. For the service to work correctly, your SIM card must also be registered on the 4G/LTE network, so it's best to replace old Mini-SIM or Micro-SIM cards with Nano-SIM cards at a mobile phone store.
⚠️ Attention: If you recently changed your phone, this feature may not work automatically. You'll need to re-register your device with the IMS network, which can take up to 24 hours, or you may need to manually reset your network settings.
The list of supported brands is constantly expanding, but flagship models remain the most compatible. Check if your device is on the recommended list, although the service often works on devices not on the official list as long as they are jailbroken and have the required software.
- 📱 Apple: iPhone 5s and newer (provided you have the latest iOS).
- 🤖 Android: Samsung Galaxy (S, Note, A series), Xiaomi (Mi, Redmi, POCO), Honor and Huawei (models with Google services or customized firmware).
- 💻 Operating systems: iOS 13+, Android 9.0+ (preferably Android 11 and above).
- 📶 Net: 4G (LTE) and VoLTE support is mandatory.
Make sure your account isn't blocked and your number is active. Sometimes the service isn't activated due to maintenance on the carrier's side in your region, so it's worth checking the network status on the official website or in the "My MegaFon" app.
Activation of the service on the operator's side
Before delving into your phone's settings, make sure the service itself is activated in your subscriber profile. MegaFon often enables this option by default for modern plans, but in some cases, manual confirmation is required. This can be done in several ways without visiting a sales office.
The fastest method is to use a USSD command or send an SMS. This initiates a request to the operator's servers, which checks the connection and activates the VoWiFi profile for your SIM card. After receiving a confirmation message, you can proceed to setting up your smartphone.
If automatic methods don't work, try using your personal account. The interface may change, but the logic remains the same: a section with services and options. Keep in mind that changes to rates or terms of service can occur regularly, so it's best to check the latest command codes in the official app.
To activate, dial a command or send a message through your phone's menu. You'll then receive a confirmation SMS. If you receive an error message or an inability to connect, it means your plan doesn't support the technology or your SIM card needs to be replaced.
Dial *105*0035# or send an SMS with the text 1 to number 5095It's worth noting that the service is free to set up and maintain. You only pay for the minutes of calls according to your plan, just as if the call were made over a regular cellular network. In your home region, calls to Russian numbers are often unlimited, and roaming rates may be more affordable than the standard rate.
Setting up VoWiFi on Android smartphones
The process for enabling this feature on Android devices can vary significantly depending on the manufacturer's operating system (MIUI, One UI, EMUI). Generally, look for it in the "Mobile Network" or "Connections" settings. On some models, the option only appears after the phone has registered with the IMS network.
First, make sure your phone has a MegaFon SIM card installed and mobile data is enabled (at least briefly for registration). Then, go to the device's main settings. The path may look like this: Settings → Connections → Wi-Fi CallingIn some cases, it is necessary to activate the slider VoWiFi or Wi-Fi Calling.
☑️ Android Setup Checklist
On devices Samsung Often you need to go to the phone menu (dialer), press the three dots in the corner, select “Settings” and find the switch there. Xiaomi And Redmi the path usually lies through Settings → SIM cards and mobile networks → Use Wi-Fi when the signal is poorIt's important to select the "Prefer Wi-Fi" mode so that your phone doesn't try to rely on a weak 3G connection when there's a powerful router nearby.
| Brand | Path to the menu | Nuances |
|---|---|---|
| Samsung | Settings → Connections → Wi-Fi Calling | May require reboot after power on |
| Xiaomi / Redmi | Settings → SIM cards → Wi-Fi calling | You need to enable VoLTE for stable operation. |
| Honor / Huawei | Settings → Mobile Network → Wi-Fi Calling | On new models without Google services it works normally. |
| Digma / BQ | Often missing from the menu | Requires reflashing or is not supported |
If you can't find the switch, try searching for "Wi-Fi" or "VoWiFi" in your phone's settings. Manufacturers sometimes hide this feature deep in the menu. Also, make sure location services are enabled—on some Android smartphones, this is a security requirement for location recognition during emergency calls (E911), although it's less critical in Russia.
What to do if the switch is gray?
If the slider is active but won't turn on (grayed out), try toggling Airplane Mode off and on again. If that doesn't help, remove the SIM card, wipe the contacts, reinsert it, and then restart your device.
Enabling Wi-Fi Calling on iPhone (iOS)
To the owners iPhone You're luckier: the setup interface is the same for all models, starting with the iPhone 5s. Apple implements carrier support at the system level, so if MegaFon has added your phone to the list of compatible phones, the feature will appear automatically after updating your carrier profile.
To activate, go to Settings → Phone → Wi-Fi CallingHere, you need to turn the switch on. The system will warn you about transmitting location data to emergency services—this is a standard protocol requirement, so agree to it. Once enabled, the status bar (where the signal strength is) will display "MegaFon Wi-Fi" or a handset icon.
It's important to note that the iPhone has an additional "On Other Devices" option. This allows you to receive calls on your iPad or Mac if they're connected to the same Wi-Fi network and use the same Apple ID. This is convenient for those within the Apple ecosystem, but enabling it on the smartphone itself isn't necessary for the basic functionality.
- 🍏 Step 1: Open Settings and select Phone.
- 📞 Step 2: Find the "Wi-Fi Calling" option.
- ✅ Step 3: Activate the toggle switch and confirm the action.
- 🔄 Step 4: If the item is not there, update iOS to the latest version.
Sometimes after an iOS update, the settings may be reset, requiring the feature to be re-enabled. Also, make sure that "Voice & Data" mode with LTE priority is enabled for your MegaFon SIM card in the "Cellular" section. Without this, calls may be dropped when moving away from a Wi-Fi zone.
Network priority and switching between Wi-Fi and LTE
One of the most important questions is how the phone behaves when moving. VoWiFi technology is designed to provide seamless handover between Wi-Fi and cellular networks. However, in practice, this process depends on the signal quality and the specific device settings.
In Android settings you can often select a priority. Mode Prefer mobile network means that the phone will use Wi-Fi for calls only if the cellular signal is very weak or absent. The mode Prefer Wi-Fi Forces the device to use the Internet channel whenever it is available, which saves battery power in areas with poor cellular reception.
⚠️ Attention: When leaving the Wi-Fi range, the call may be disconnected if your phone doesn't support SRVCC (Speed Transfer Collaboration from LTE to 2G/3G) or if the network transition is not configured correctly. Test the transition in a safe environment.
On iPhone The transition is smoother, but still not perfect. If you leave the house, the phone will attempt to transfer the call to the base station. During this time, the sound quality may temporarily degrade. If you frequently move between floors or buildings, it's best to prioritize the mobile network to avoid unexpected disconnects.
Problem solving and troubleshooting
Even with proper setup, errors can still occur. The most common issue is that the VoWiFi icon doesn't appear, or calls don't go through. First, check if your Wi-Fi connection is working. If websites don't load, calls won't go through either, as the technology is completely dependent on the data connection.
The second common issue is port blocking by your home internet provider. Some providers (especially corporate ones or those in dorms) block protocols required for VoWiFi. In this case, changing the DNS server in your router settings or using mobile internet through a hotspot, if your plan allows, can help.
It's also worth checking whether the "Data Saver" or "Ultra Data Saver" modes are enabled on your smartphone. These features can limit background activity of apps and phone services, preventing the phone from registering with the IMS network. Disable them to test.
- 🔌 Reboot: Simply turning your phone off and on solves 80% of problems with registering online.
- 📡 Network reset: In the Android/iOS settings there is a function called “Reset network settings” (not to be confused with a full reset of the phone!).
- 📶 Roaming: Make sure that Voice Roaming is enabled in your phone settings, even if you are in your home region (this sometimes affects IMS operation).
- 🛡️ Antiviruses: Third-party firewalls may block SIP ports required for calls.
If all else fails, there may be a problem with your carrier or a specific gateway. Try calling MegaFon support from a different number. Engineers can check if they see your device attempting to register with the VoWiFi network.
Why are my Wi-Fi calls dropping?
This could be due to an unstable internet connection, bandwidth congestion (someone downloading torrents), or a weak router signal. Try moving closer to the access point or rebooting the router.
Do you charge for Wi-Fi calls when roaming?
Yes, roaming charges apply according to your plan's terms. However, when in a Wi-Fi zone, you avoid incoming and outgoing calls on GSM, which is often cheaper. Check the rates for your specific country.
Is it possible to use VoWiFi without mobile internet?
Technically yes, but for initial registration on the IMS network, mobile internet (packet data) must be enabled at least momentarily. After registration, calls will be made via Wi-Fi, even if mobile data is disabled.
Does the service work if the phone is unlocked (locked to a different operator)?
If the phone is locked to a foreign carrier, this feature may not work, as the device is checking the SIM card. If the phone is simply unbranded or locked to a Russian carrier (not MegaFon), there are usually no problems.
Does VoWiFi require Bluetooth to be enabled?
No, Bluetooth is not required for the technology to work. However, if you're using a wireless headset, it must be connected. Voice transmission itself is via Wi-Fi.