VoWiFi (Voice over Wi-Fi) allows making calls and sending SMS via a Wi-Fi network instead of the traditional mobile connection. This technology is particularly useful in areas where mobile coverage is weak, such as certain apartments, basements, or rural areas. The Xiaomi Poco F4, compatible with VoWiFi, can utilize this feature with Orange and SFR, but activation requires a few specific steps and verification of certain network settings.
Check smartphone and carrier compatibility
Before any manipulation, it is crucial to ensure that the Poco F4 and your plan allow VoWiFi. The smartphone must be equipped with a recent MIUI version, ideally MIUI 14 or 13 with Android 13, to benefit from full compatibility with VoWiFi.
With Orange and SFR, not all plans support VoWiFi: standard 4G/5G offers are compatible, but some prepaid or professional offers may require additional validation from customer service. A simple check of the technical sheet or the customer area is enough to confirm possible activation.
Update the Xiaomi Poco F4 to ensure compatibility
An unupdated Poco F4 may not display VoWiFi options in the settings. To check and install updates:
- Open the phone’s Settings
- Go to About phone
- Select System updates and install any available version
This step ensures that the system integrates the latest network patches and support for VoWiFi options specific to Orange and SFR.
Activate network options for VoWiFi
VoWiFi requires that Wi-Fi is enabled and prioritized for calls. On the Poco F4, the procedure is as follows:
- Open Settings
- Go to SIM cards & mobile networks
- Select the active SIM for calls
- Look for the Wi-Fi Calling or VoWiFi option
- Activate the corresponding button
Once activated, the phone may display the Wi-Fi icon with a call symbol, indicating that communications now use the Wi-Fi network when available.
Specific settings for Orange and SFR
With Orange, VoWiFi is often automatically activated if the plan is compatible and Wi-Fi is available. It is nevertheless advisable to:
- Check that the SIM is correctly recognized by the 4G/5G network
- Ensure that VoLTE (Voice over LTE) is also activated, as it is often necessary for VoWiFi
With SFR, it may be necessary to contact customer service to authorize VoWiFi on certain plans. After activation, the Poco F4 can automatically switch between mobile and Wi-Fi networks depending on the connection quality.
Optimize the Wi-Fi connection for stable calls
VoWiFi entirely depends on the quality of the Wi-Fi network. To avoid interruptions or poor-quality calls:
- Use a stable Wi-Fi connection with a speed higher than 2 Mbps for calls
- Avoid public or congested networks that may cause dropouts
- Place the router nearby to ensure optimal reception
These precautions ensure that the Poco F4 fully exploits VoWiFi for clear and stable calls.
Verify VoWiFi in real situations
Once activated, VoWiFi can be tested simply:
- Disconnect the mobile network or place yourself in an area with weak 4G/5G coverage
- Make a call from the phone
- Observe if the Wi-Fi icon with the call symbol appears
If the call goes through correctly, VoWiFi is working, and the Poco F4 uses Wi-Fi for voice transmission.