Wi-Fi Calling: Which Phones Support It and How to Activate It

The situation when your smartphone shows "no network" while you're in an office or apartment with thick walls in a modern metropolis is familiar to many. Often, the problem isn't a malfunction of the device, but rather the physics of radio wave propagation, which simply can't penetrate dense concrete or metal reinforcement. This is where technology comes into play. VoWiFi (Voice over Wi-Fi), which allows you to make voice calls and send SMS messages over an Internet connection, bypassing standard cell phone towers.

This feature turns your router into a mini base station, providing crystal-clear sound even in a basement or remote home. However, not all devices support this protocol out of the box, and carriers implement it at varying speeds. In this article, we'll discuss What phones have it? Native Wi-Fi calling support, how to activate hidden settings, and what to do if the desired button doesn't appear in the menu.

Technology implementation depends on three factors: your smartphone's capabilities, your carrier's policies, and the firmware version. It's common for a phone to be hardware-ready, but software-locked to specific SIM cards. Understanding these nuances will help you avoid guesswork and instead know exactly what to expect from your device.

⚠️ Please note: Wi-Fi Calling support depends not only on your phone model but also on whether your data plan is enabled with your carrier. Make sure the service is enabled with your carrier before accessing settings on your phone.

VoWiFi Technology: How It Works and Why It's Necessary

Technology Voice over Wi-Fi Allows voice traffic to be transmitted over IP protocols, similar to messaging apps, but integrated into your standard phone book. You don't need to open a separate app, redial a number, or wait for the other person to answer—the call is placed as if you were in a strong LTE or 3G coverage area. This is especially critical for buildings with shielded coverage or remote areas where cellular signal is completely absent.

The main advantage over regular calls via internet apps (Viber, WhatsApp, Telegram) is transparency for the user and often better audio quality (HD Voice). Furthermore, with many plans, minutes spent on Wi-Fi calls don't expire; they're either included in the regular package or billed separately, which can be more cost-effective than using mobile data. The system automatically switches calls from Wi-Fi to the mobile network and back without interrupting the connection if you leave the router's range.

This technology requires a stable access point with minimal latency (ping). If your internet connection is overloaded with downloads or torrents, connection quality may degrade, causing artifacts or interruptions. Therefore, before enabling this feature, make sure your router can handle the load and provides a stable signal.

List of Samsung smartphones with Wi-Fi Calling support

Company Samsung is one of the leaders in implementing modern telecommunications standards in its devices. Starting with the flagship Galaxy S and Note (now Z) lines, VoWiFi support is present in almost all models released since 2016. However, as with other manufacturers, the presence of native support does not guarantee that the feature will work with any carrier without additional configuration.

In the budget segment, the situation is a bit more complicated: the Galaxy A series receives support selectively, often depending on the region of release and the specific carrier. For example, a phone purchased in Europe may not have a VoWiFi menu for Russian or Ukrainian SIM cards out of the box, requiring a region-specific CSC code change or a firmware update. Flagships, however, typically avoid these limitations and work with most major carriers.

Activating this feature on Samsung devices typically requires going into Settings, but the path may vary. In newer One UI skins, it's often hidden in the Connections menu. If you don't see the toggle, your carrier may require installing a special profile or authenticator app, although this practice has been gradually phased out in favor of native integration in recent years.

Samsung's Hidden Engineering Test Menu

Enter the code ##4636## In the dialer app. In the menu that opens, select "Phone Information." There you'll find advanced radio module settings, but be careful: changing these settings without understanding them could result in network loss.

Xiaomi, Redmi, and POCO Smartphones: Activation Features

Devices from Xiaomi, including sub-brands Redmi And POCO, are extremely popular, but also have the most issues with Wi-Fi calling. The problem is that Chinese firmware versions (CN) often lack certification for VoWiFi functionality with international carriers. Global versions (Global) don't have this issue, but even in them, the feature may be hidden by software for certain regions.

Users often encounter a situation where the carrier supports the technology, the phone supports it, but the switch doesn't appear. In such cases, changing the region in the phone settings helps. Switching to the "India," "Singapore," or "Russia" region (depending on the model) can unlock the hidden menu. It's also worth paying attention to the MIUI or HyperOS version—beta versions may show features earlier, but may be unstable.

It's important to note that some Redmi models with MediaTek processors may implement VoWiFi differently than Snapdragon models. If you're unable to activate the feature using standard methods, you may need to root your device and edit system configuration files. However, this will void the warranty and requires a high level of expertise.

iPhone and iOS: Full Compatibility or Limitations?

With devices Apple The situation is most straightforward: if your iPhone model supports the technology (iPhone 6 and later) and has the latest version of iOS, then the ability to enable Wi-Fi calling depends solely on your carrier. Apple doesn't hide these settings deep in menus, providing a uniform interface for all countries. However, if your carrier hasn't certified your device for their network, the toggle may be missing or inactive.

To activate on iPhone, you need to go to Settings → CellularIf your carrier supports the feature, you'll see the "Wi-Fi Calling" option. In some cases, you'll need to update your carrier profile, which happens automatically when you connect to the internet, or manually update it via Basics → About this deviceOnce enabled, the feature works seamlessly, switching between networks without user intervention.

Worth mentioning is the "Calls from Other Devices" feature, which is an extension of VoWiFi technology in the Apple ecosystem. It allows you to receive calls from your iPhone on your iPad, Mac, or Apple Watch using the internet connection of these devices. This requires all devices to be on the same Wi-Fi network and use the same Apple ID, creating a convenient communication environment.

⚠️ Note: When making Wi-Fi calls on your iPhone, the recipient can see your number, but in some cases (especially when calling emergency services), the operator may not receive your exact location. Always confirm your address with the dispatcher when calling emergency services.

Other popular brands: Huawei, Honor, Realme

Android-based brands such as Huawei, Honor And Realme, are also actively implementing Wi-Fi calling support. Huawei and Honor devices, especially newer models without Google services, often implement this feature very well and enable it automatically when a compatible SIM card is detected. EMUI and MagicOS have a clear menu for managing this setting.

Smartphones Realme And Oppo (which often share common components) also support VoWiFi, but the menu may be labeled differently, such as "Wi-Fi Calling" or "Call over Wi-Fi." Depending on the ColorOS version, the switch may be located either in the general network settings or within the SIM card-specific menu. Users should be careful when updating the system, as major Android updates may reset settings.

Below is a table to help you quickly identify the availability of this feature in popular smartphone lines of different years of release:

Step-by-step instructions: how to enable VoWiFi on Android and iOS

The activation process may vary, but the general steps are similar for most devices. Before you begin, make sure your smartphone is connected to Wi-Fi and your SIM card is active. Also, make sure you have sufficient funds in your account or are on a data plan that supports the service.

For Android devices, the path often looks like this: open Settings, find the section Connections or Network and Internet. Next, select Wi-Fi calls or Wi-Fi callingIf the option isn't in the main menu, go to the settings for your specific SIM card (if you have two) and look for the switch there. In some cases, you may need to enable "Wi-Fi Preference" or "Wi-Fi Only" to force the phone to use the internet for calls.

On iPhone the algorithm is simpler: Settings → Cellular → Wi-Fi CallingMove the slider to the active position. If you use multiple Apple devices, you can also enable the option to add other devices there. Once enabled, a "Wi-Fi" icon or a phone handset with the word "Wi-Fi" will appear in the status bar next to your carrier's name.

Common problems and solutions

Even with compatible equipment, users often encounter errors. One of the most common is that the VoWiFi icon appears, but calls fail or are dropped. This often indicates NAT issues on the router or ports being blocked by the internet service provider. In such cases, rebooting the router or changing DNS servers to more reliable ones, such as Google's, can help.8.8.8.8) or Cloudflare (1.1.1.1).

Another issue is that the phone doesn't switch back to the cellular network when leaving the house, and calls are dropped. This may be due to power saving settings that aggressively disable Wi-Fi when the screen is locked. Try adding your phone service to the power saving mode exceptions or disabling "Smart Network Switching" if that option is available in the Wi-Fi menu.

If you've switched carriers but your phone still thinks it's using your old one, you may need to reset your network settings. This won't delete your personal data, but it will return all network settings to factory defaults, which often resolves profile conflicts. Here's how to reset: Settings → System → Reset settings → Reset Wi-Fi, mobile data, and Bluetooth settings.

⚠️ Note: Settings interfaces may vary depending on the operating system version and manufacturer's shell. If you don't find the described options, search your phone's settings by searching for "Wi-Fi calling."

FAQ: Frequently Asked Questions

Are minutes charged for Wi-Fi calls?

This depends on your tariff plan. Most modern operators count these minutes as standard domestic voice calls. However, if you're abroad, Wi-Fi calls to numbers in your home region may be charged as standard incoming and outgoing roaming calls, which can be significantly cheaper than standard roaming, but still incurs a charge. Check with your provider for details.

Do I need a special plan for Wi-Fi Calling?

A separate plan is usually not required; your current plan must support VoWiFi technology. Some older, archived plans may not be technically capable of enabling the service. In this case, your operator may offer to upgrade to a current plan.

Does Wi-Fi Calling work if the phone is locked?

Yes, you can make emergency calls (112, 911, etc.) even without a SIM card or when your phone is locked, as long as you have a Wi-Fi connection and your phone supports Emergency over Wi-Fi. However, a SIM card is required for regular calls.

Does VoWiFi affect internet speed?

Voice traffic uses very little (usually around 64-128 kbps), so it won't significantly impact page loading speeds or video playback. However, if the bandwidth is very low (less than 1 Mbps), problems with both calls and internet connection may occur.