If you are a smartphone owner POCO (For example, POCO X5 Pro, POCO F5 or earlier models), you may have noticed an option in your phone settings Wi-Fi Calling (or Wi-Fi Calling). At first glance, it seems like a simple alternative to mobile communications, but in reality, this feature solves a much wider range of problems—from saving battery power to maintaining a stable connection in areas with poor coverage.
In this article we will take a detailed look at What is Wi-Fi calling on POCO?, how it works technically, what benefits it offers, and how to set it up correctly. You'll also learn about common issues (for example, why the feature doesn't turn on or why calls are dropped) and how to fix them. This material is relevant for all modern models. POCO at the base MIUI or HyperOS, including budget and flagship devices.
What is Wi-Fi calling and how does it work?
"Wi-Fi Calling"** Wi-Fi Calling) is a technology that allows voice calls and SMS messages to be sent over the internet rather than traditional cellular networks. The feature is integrated into smartphone firmware. POCO and is supported by most modern telecom operators (for example, MTS, Beeline, Megaphone, Tele2).
Technically, the work is structured as follows:
- 📶 The smartphone connects to Wi-Fi networks (home, office or public).
- 🔄 Instead of using a cell tower to transmit voice, data is transmitted over the Internet using a protocol VoIP (For example, IMS).
- 📞 The call is routed through the operator's servers, and at the other end the subscriber receives it as a regular mobile call.
Important: It's not the same as instant messengers. (For example, WhatsApp or Viber). Calls via Wi-Fi Calling are sent to a standard phone number, not to an app account. Therefore, the recipient on the other end doesn't need to install any apps—they'll simply see the incoming call as if you were calling from a mobile network.
Advantages and disadvantages of the function
Why use Wi-Fi calling on POCO?
| Advantages | Flaws |
|---|---|
| 🔋 Saves battery life (no need to constantly search for a cellular network). | ⚠️ Requires a stable Wi-Fi connection (if the connection is lost, the call may be interrupted). |
| 🏠 Better connection quality in buildings with poor coverage (basements, shopping centers). | ⚠️ Not all operators support this feature (check with your provider). |
| 🌍 Works abroad without roaming (if connected to local Wi-Fi). | ⚠️ Voice delays are possible under high network load. |
| 📱 Supported on all modern POCO (from POCO X3 and newer). | ⚠️ Some plans may charge a fee (rare, but worth checking). |
One of the key advantages is the ability to make calls even in places where there is no cellular service, but there is Wi-Fi (for example, in the countryside or at a dacha with internet from Starlink). However, if your operator does not support Wi-Fi Calling, the function simply won't work, even if you enable it in the settings.
How to enable Wi-Fi calling on POCO
The function activation algorithm depends on the firmware version (MIUI or HyperOS) and smartphone models. Below are universal instructions for most devices. POCO:
- Open
Settings→SIM cards and mobile networks. - Select your SIM card (if you have two).
- Find the item
Wi-Fi calling(orWi-Fi Calling) and move the slider to the positionOn. - Confirm activation (a reboot may be required).
If the item is not in the menu, check:
- 🔄 Update the firmware to the latest version (path:
Settings → About phone → System update). - 📱 Make sure your model supports the function (the list of compatible devices is on the website Xiaomi).
- 📡 Check if your carrier supports it Wi-Fi Calling (the list is usually available in your personal account).
☑️ Check before enabling Wi-Fi Calling
On some models (eg, POCO F3) The function may be hidden in additional settings. If you can't find it, try searching for it in the settings search. «Wi-Fi Calling».
⚠️ Attention: On POCO With two SIM cards, the function can only work on one of them (usually on the one that is installed in the slot) SIM 1). Check this in the settings.
Why isn't Wi-Fi calling working on POCO?
If the feature is enabled, but calls still go through the mobile network or do not go through at all, the reasons may be as follows:
| Problem | Solution |
|---|---|
| The operator does not support Wi-Fi Calling. | Check the list of supported operators on the website Xiaomi or in your provider's personal account. |
| Weak Wi-Fi signal. | Connect to a different network or move closer to the router. |
| The function is disabled in the SIM card settings. | Go to Settings → SIM cards → [your SIM] → Wi-Fi calling and turn it on. |
| Outdated firmware. | Update MIUI/HyperOS to the latest version. |
| Conflict with VPN or firewall. | Disable your VPN and check your firewall settings (if you use one). |
If after all these manipulations the function still doesn’t work, try:
- Remove and reinsert the SIM card.
- Reset network settings (
Settings → SIM cards → Reset network settings). - Contact your operator's support with a request to activate Wi-Fi Calling on your number.
What to do if calls are dropped?
If the connection drops during a call using Wi-Fi Calling, check:
- Wi-Fi stability (reconnect or reboot the router).
- Network load (perhaps someone is downloading large files).
- QoS settings on the router (prioritize voice traffic).
If the problem persists, disable the feature and use a mobile network.
How to disable Wi-Fi calling on POCO
If you don't need the feature or are experiencing problems (for example, calls aren't going through), you can easily deactivate it:
- Go to
Settings → SIM cards and mobile networks. - Select your SIM card.
- Find the item
Wi-Fi callingand move the slider to the positionOff.
After disabling, all calls will be routed through the standard mobile network. If this feature was causing problems, the connection should stabilize.
⚠️ Attention: On some firmware versions MIUI after shutdown Wi-Fi Calling You may need to restart your phone for the changes to take effect.
Comparison with VoLTE: Which is Better?
Many users are confused "Wi-Fi calling"** (Wi-Fi Calling) And VoLTE (voice communication over 4G). Although both technologies improve communication quality, they work differently:
- 📶 VoLTE - calls are going through mobile Internet (4G/5G), but not via Wi-Fi. Requires carrier and smartphone support.
- 📶 Wi-Fi Calling - calls are going through Wi-Fi network, even if there is no mobile connection.
Which technology to choose?
- 🏙️ In a city with good 4G coverage, it is enough VoLTE.
- 🏡 In buildings with a poor signal, but stable Wi-Fi is better Wi-Fi Calling.
- ✈️ Abroad (no roaming) - only Wi-Fi Calling.
On POCO Both features can be enabled simultaneously. In this case, the phone will automatically select the best option based on the conditions.
Security and privacy
Many users are concerned about the security of Wi-Fi calls. Here are the key points:
- 🔒 Encryption: Voice traffic in Wi-Fi Calling encrypted according to operator standards (usually AES or SRTP).
- 🌐 Routing: The data passes through the operator's servers, not through public nodes (unlike Skype or Zoom).
- 📡 Risks: When connecting to public Wi-Fi (for example, in a cafe) interception of traffic is theoretically possible, but unlikely due to encryption.
To minimize risks:
- 🛡️ Use VPN when connecting to unfamiliar networks.
- 🔄 Update your firmware regularly POCO (vulnerability fixes).
- 📵 Turn it off Wi-Fi Calling in public places if you are unsure about the security of the network.
Generally, Wi-Fi Calling It's safer than making calls via instant messaging apps because it uses the mobile operator's infrastructure rather than third-party servers.
FAQ: Frequently asked questions about Wi-Fi calling on POCO
🔹 Can I use Wi-Fi Calling without a SIM card?
No, the function is tied to the SIM card and phone number. Without an active SIM card Wi-Fi Calling will not work even if the phone is connected to Wi-Fi.
🔹 Why does the Wi-Fi icon appear on the screen during a call?
This is normal - this is how the phone signals that the call is going through Wi-Fi Calling, not via a mobile network. The icon may differ depending on the firmware (for example, Wi-Fi or VoWiFi).
🔹 Will Wi-Fi calls be charged like regular calls?
Yes, there is no difference for the subscriber—the call is charged at the rate as if you were calling via a mobile network. Exception: some operators may offer free minutes for Wi-Fi Calling (check in your personal account).
🔹 Does Wi-Fi Calling work on POCO with dual SIM cards?
Yes, but usually only on one SIM (more often on SIM 1). In the settings, you can choose which card to enable the function for.
🔹 Can I call numbers in other countries using Wi-Fi Calling?
Yes, but you'll be charged the same as an international call (unless you have an unlimited international calling plan). The main advantage is that you don't have to pay roaming fees if you're abroad and connected to local Wi-Fi.
If your question isn't covered in the FAQ, check the official documentation. Xiaomi for your model or contact your operator's support.