Many subscribers are familiar with situations where standard cellular service is intermittent or completely lost. This can occur in dense urban areas, office basements, shopping malls with thick walls, or even in your own apartment if the nearest tower is far away. It's in these critical situations that technology comes to the rescue. VoWiFi, which allows you to make voice calls over an Internet connection.
MegaFon is actively developing this feature, giving its customers the ability to stay connected in areas where a regular GSM/LTE signal isn't available. The technology is transparent to the user: you simply dial a number, and the smartphone automatically selects the best voice channel. Understanding how this feature works will help you avoid billing and connection quality issues.
Implementation Voice over Wi-Fi This is operators' response to the growing load on base stations and the need for stable indoor coverage. For subscribers, this means no more "dead zones" in areas with strong Wi-Fi coverage. Below, we'll detail the technical details, equipment requirements, and a step-by-step guide to activating the service on various devices.
VoWiFi Technology: Operating Principles and Benefits
Technology Wi-Fi Calling (or VoWiFi) is a method of transmitting voice traffic over IP protocols, similar to how data is transmitted when browsing the web. However, unlike popular messaging apps, this service is integrated directly into your smartphone's standard phone book and dialing interface. This means you don't need to open a separate app or ask your contact to install a special program.
When you make a call, your smartphone Determines the availability of the cellular network. If the signal is weak or absent, but there is a Wi-Fi connection, the device redirects the voice stream via the internet to the operator's servers. To the person on the other end, this call appears as a regular incoming call from your number. The call quality often exceeds standard, especially if using broadband.
A key benefit is battery conservation. In poor cellular reception, the phone constantly struggles to find a signal, which leads to rapid battery drain. Using a stable Wi-Fi connection reduces the radio module's power consumption. Furthermore, these calls are billed according to your primary data plan, which is especially beneficial when roaming abroad.
⚠️ Please note: Voice call quality directly depends on the stability of your internet connection. If the bandwidth drops below the minimum threshold, the call may be disconnected or switch to compressed audio.
Hardware requirements and device compatibility
To successfully use the service, simply having a MegaFon SIM card is not enough. Your device must support the technology. IMS (IP Multimedia Subsystem) at the hardware and software levels. Most modern smartphones released after 2016-2017 are already equipped with the necessary modules. However, software support depends on the manufacturer and regional firmware version.
MegaFon officially supports a wide range of devices. The list of compatible models includes popular models from Apple, Samsung, Xiaomi, Huawei and other vendors. It's important to understand that even if a phone is technically capable of working with VoWiFi, the operator must whitelist it for network profiling to work correctly.
Below is a table with examples of popular models and their technology support status:
| Brand | Model | Support status | Setting nuances |
|---|---|---|---|
| Apple | iPhone 6 and newer | Full | Requires iOS 13+ |
| Samsung | Galaxy S7 and newer | Full | A network settings reset may be required. |
| Xiaomi | Redmi Note 8 and newer | Partial | Depends on the MIUI version |
| Huawei | P30 and newer | Full | Automatic activation |
If your device isn't listed, it doesn't always mean the feature won't work. Support is often added with software updates. Check for system updates in your device's settings.
Activating the service and checking the tariff plan
Before setting up your phone, you need to make sure the service is activated on the operator's side. In MegaFon, the function Wi-Fi Calling This feature is typically available by default for most modern tariff plans, but in some cases, manual activation is required. This can be done through your personal account, mobile app, or USSD command.
To activate via your personal account, log in to your profile on the operator's website or in the MegaFon app. Find the section with additional services or communication settings. There should be an option for "Wi-Fi Calling" or "VoWiFi." Make sure the toggle is enabled. It's also worth checking that the service isn't blocked by parental controls or other restrictions on your phone number.
⚠️ Please note: Service terms and pricing are subject to change. Always check your personal account or contact your operator's official representatives for up-to-date connection information.
After activation by your carrier, you may need to reboot your smartphone to receive the new network settings. If the feature doesn't appear after rebooting, try removing the SIM card and reinserting it, making sure your phone is connected to the internet.
☑️ Checking connection readiness
Setting up Wi-Fi Calling on Android devices
The process of enabling the function on smartphones running Android This may vary depending on the manufacturer's shell. In most cases, configuration is performed through the standard system settings menu. If the menu item is missing, your carrier may not have certified the device, or a firmware update is required.
Let's look at the general procedure. First, go to your phone's main settings. Find the section related to networks and connections. It may be called "Connections," "SIM cards and mobile networks," or "Mobile network." Inside this section, look for "Wi-Fi calling."
On some Android versions, the path may look different. For example, on Samsung devices, you need to go to Settings → Connections → Wi-Fi CallingIn Xiaomi smartphones, the path is often hidden: Settings → SIM cards and mobile networks → Select SIM card → Wi-Fi callingAfter turning on the switch, the system may ask for address confirmation for emergency services.
⚠️ Note: On some Android devices, this menu item may be hidden. Try searching for "Wi-Fi" or "VoWiFi" in Settings.
If standard methods fail to enable the feature, you can try resetting your network settings. This will delete saved Wi-Fi passwords and Bluetooth settings, but often helps refresh your carrier profile. To do this, go to Settings → System → Reset settings → Reset Wi-Fi, mobile data, and Bluetooth settings.
What should I do if the function does not appear after resetting the settings?
If resetting doesn't help, try manually entering the APN settings. Go to your mobile network settings, select your SIM card, and find "APN Access Points." Create a new APN or edit an existing one from MegaFon. The APN field should say "internet." Save your changes and restart your phone. In rare cases, you may need to install a special configuration profile, which you can request from support.
Instructions for iPhone (iOS) users
For smartphone owners Apple We're lucky to have a unified settings interface for all models. Starting with iOS 13, support for this technology is native and requires minimal user intervention. The main requirement is the current version of the operating system and activated service from your carrier.
To activate, go to the menu Settings → CellularIf you have two SIM cards (a physical one and an eSIM), select the desired number. Find "Wi-Fi Calling" and toggle the switch. The system will prompt you to enter your emergency call address (E911). This is a mandatory requirement by regulators, even if you are located in Russia.
An important detail for iPhone is the requirement for location services to be enabled. For emergency services to work properly when making calls over Wi-Fi, location services must be allowed. Without this permission, the feature may work intermittently or not activate at all.
Once enabled, "Wi-Fi" will appear in the status bar next to the carrier name. This indicates that the phone is ready to route voice traffic over the internet. If you're in an area with strong cellular coverage, the phone will still use it, switching to Wi-Fi only when the signal deteriorates, if the appropriate priority is set.
Network priority and switching between Wi-Fi and LTE
One of the most important questions is how a phone behaves when switching between networks. Modern algorithms Handover Call transfers allow seamless transitions between Wi-Fi and mobile networks without interrupting the connection. However, the implementation of this feature depends on the specific device and software version.
In Android settings, you can often select network priority. Options include "Prefer Wi-Fi," "Prefer Mobile Network," or "Don't Ask." Selecting "Prefer Wi-Fi" will force the phone to use the internet whenever it's available, even if the cellular signal is strong. This can be useful for saving data if you have a limited data plan.
When leaving the Wi-Fi range of your router, your phone should automatically switch to LTE/3G. Ideally, your call will continue uninterrupted. However, if the cellular signal is weak where you leave your home, you may experience a brief drop in audio or even a dropped call. It is critical to have at least a minimum cellular network signal (1-2 bars) to successfully handover a call from Wi-Fi to a mobile network.
If you notice your phone getting stuck on Wi-Fi even with a strong signal, check your settings. Your wireless network may be set to a strict priority. Also, keep in mind that some routers may not process voice traffic packets correctly, causing delays.
Common problems and solutions
Despite the technology's robustness, users may encounter difficulties. The most common issue is the absence of the "Wi-Fi" or "VoWiFi" icon in the status bar. This may indicate that the phone is connected to the network but is unable to establish a secure connection with the carrier's servers (IMS). Check whether your router or antivirus software is blocking the required ports.
Another issue is one-way audio or echo. This is often due to router settings or channel congestion. Try rebooting the router. If you're using public Wi-Fi networks (in cafes or airports), the feature may not work because it requires authorization via a web page (Captive Portal), which the phone can't handle for voice traffic.
If all else fails, perform a full re-registration on the network. Turn on airplane mode for 10-15 seconds, then turn it off. Wait for the 4G/LTE and Wi-Fi Calling icons to appear. As a last resort, contact MegaFon technical support to check your number's network settings.
Is there a charge for making calls using Wi-Fi Calling?
Calls made via Wi-Fi Calling on MegaFon are billed the same as regular voice calls. Minutes are deducted from your bundled plan. If you're in your home region, calls are charged according to your plan's terms. If you're roaming internationally and calling your home region, the call is considered incoming (free) or outgoing according to roaming terms, but Wi-Fi traffic isn't deducted from your mobile plan.
Is it possible to use Wi-Fi Calling without a SIM card?
No, an active MegaFon SIM card registered to the device is required for the technology to work. The technology uses the SIM card for authentication on the operator's network. Without a SIM card or if the phone doesn't see the operator's network, the feature will not work, even if Wi-Fi is connected.
Does Wi-Fi Calling affect internet speed?
Voice traffic takes up a small portion of the channel's bandwidth (usually around 64-128 kbps). On modern broadband connections, this is completely unnoticeable. However, if you're downloading large files or watching 4K video on one device while an important conversation is taking place on another, micro-delays may occur.
Does this feature work if the router is sharing internet from a mobile phone?
Yes, it's technically possible. If your smartphone is sharing data via Wi-Fi (tethering) and another phone is connected to the same network, the call will go through via Wi-Fi Calling. However, this doesn't make economic sense, as the traffic will still go through the first phone's mobile network, and double billing is unavoidable.