Modern smartphones such as Blackview BV9000 Pro, are designed to operate in extreme conditions, but even the most rugged case doesn't always protect against cellular dead zones. In basements, remote offices, or country houses, the signal from base stations is often too weak for stable voice calls. This is where technology comes in. VoWiFi, which allows voice transmission over the Internet.
Activating this feature on stock Android devices, like this model, may differ from the familiar Samsung or Xiaomi menus. Users often have to dig through hidden settings or check carrier compatibility to take advantage of HD voice without using third-party messaging apps.
In this article, we'll cover in detail how to enable WiFi Calling on the Blackview BV9000 Pro, what carrier requirements must be met, and what to do if the standard activation path doesn't work. You'll learn how to check for service support and how to properly configure network priority for uninterrupted connectivity.
Checking service support by your telecom operator
Before delving into your smartphone's deep settings, make sure your mobile operator offers VoWiFi and that it's activated on your SIM card. This technology doesn't work automatically for all subscribers; it requires a specific data plan or service. Without this step, any phone interactions will be futile.
Most major federal carriers have already implemented this feature, but conditions may vary. For example, some require a 4G/LTE network as a base network, while others only allow WiFi. Important Check to see if your plan supports voice calls over the internet, as this option may not be available on some older plans.
β οΈ Please note: Even if your phone supports the technology, your operator may block calls via WiFi if you are abroad (roaming), unless this is provided by your tariff.
To activate the service, it's often enough to send a USSD command or use your operator's personal account. After the service is activated on your SIM card, your phone will receive an updated settings profile, allowing the corresponding menu items to appear.
Standard activation method via Android settings
In the Android operating system, which is installed on Blackview BV9000 ProThe path to enabling this feature is generally standardized, but may vary slightly depending on the firmware version. First, navigate to the device's main settings menu.
Find the section responsible for wireless networks. Depending on your location, it may be called "Network & Internet" or "Connections." This is where the main switches for mobile data and calls are located.
The further algorithm of actions looks like this:
- π± Click on the item
Mobile networkorSIM cards and mobile networks. - πΆ Find the switch Wi-Fi calling (Wi-Fi Calling) and activate it.
- π In the preferences menu that appears, select "Wi-Fi Preference" or "Wi-Fi Only" if you want to save battery power from your cellular module.
If, after turning on the switch, a phone icon with a WiFi symbol or the text "VoWiFi" appears in the status bar next to the WiFi indicator, the feature is working correctly. Now you can make and receive calls even without a cellular signal, as long as you have a working internet connection.
βοΈ Check VoWiFi activation
Using the engineering menu to activate
In cases where the standard switch in the menu is missing or hidden by the operator, you can use the Android engineering menu. This method allows you to access hidden modem functions. Blackview BV9000 Pro The standard testing access code often works.
Open the Phone app (dialer) and dial the combination ##4636##If the code is correct, the "Testing" menu will open, where you should select "Phone information." Scroll down to the "Set Preferred Network Type" section.
From this list, you should select a mode that supports LTE and VoLTE, as WiFi Calling is often tied to these protocols. However, more specific settings may be hidden in another engineering menu accessible via code. ##3646633## (MediaTek Performance Test), which is relevant for MediaTek processors used in Blackview.
Path in MediaTek engineering menu:
Telephony -> Voice Capabilities -> Voice over IMS (toggle to Enable)
Be careful when changing settings in the engineering menu. Incorrect radio module configuration may result in complete loss of network connectivity. Changing the Voice over IMS parameter is key to forcibly activating VoWiFi on some firmware versions.
What to do if the codes don't work?
Some carriers or Android versions block access to the engineering menu using standard codes. In this case, install the "Activity Launcher" app from Google Play, find "IMS Service" or "DcConfig" in the list, and try launching the hidden call settings activities.
Setting up network priority and roaming
After successfully activating the feature, it's important to properly configure your smartphone's behavior when switching between networks. By default, Android may prioritize cellular networks even with a weak signal, ignoring available Wi-Fi, which leads to dropped calls.
In the WiFi Calling settings menu (the same place where you enabled the feature), there is often an option called "Preferred network for calls." Here, you should select the "Prefer Wi-Fi" option. This will force Blackview BV9000 Pro use the Internet channel for voice, even if there are 1-2 bars of cellular communication.
Roaming settings deserve special attention. If you travel, using WiFi Calling can be a great way to avoid international roaming charges, as WiFi calls are often billed as local or incoming calls, regardless of your physical location.
| Parameter | Recommended value | Impact on work |
|---|---|---|
| Network preference | Wi-Fi is preferred | The voice goes through the Internet if there is WiFi. |
| VoWiFi Roaming | Included | Allows you to make calls via WiFi abroad |
| Mobile data | Enabled (background mode) | Required for IMS profile registration |
Please note that switching between WiFi and mobile networks during a call may cause a brief interruption unless the Handover feature is configured. Currently, not all carriers support seamless switching between networks.
Troubleshooting connection and VoWiFi icon issues
A common problem users face is that the service is connected and the settings are correct, but the VoWiFi icon doesn't appear, and calls are made through the regular network. This may be due to an APN profile conflict or outdated network settings.
First, try resetting your network settings. This won't delete your personal data, photos, or contacts, but it will return all network settings to factory defaults. Here's how to reset: Settings β System β Reset settings β Reset Wi-Fi, mobile data, and Bluetooth settings.
The problem may also lie with the router itself. Some ISPs or WiFi security settings (such as strict firewalls or blocking certain UDP ports) can interfere with voice traffic. Try temporarily disabling IPv6 in your router or changing your DNS to a public one (e.g., Google's 8.8.8.8).
β οΈ Important: If the VoWiFi icon flashes or disappears during a call, check if the "Guest Network" mode is enabled on your router for your phone. This often isolates devices from each other and blocks necessary ports.
In rare cases, manual APN registration is required. Go to Settings β Mobile network β SIM cards β Access point names (APN). Select your carrier's active access point and make sure the "APN type" field is set to default,supl,ims. Availability of parameter ims critical for VoLTE and VoWiFi to work.
The influence of the software version and the specifics of Blackview
Smartphones of the brand Blackview They are known for their reliability, but their software sometimes requires updates to ensure full compatibility with new operator features. The manufacturer regularly releases security patches and system improvements.
Check for system updates. Go to Settings β System β System UpdateIf a new firmware version is available, we recommend installing it, as the changelog often includes network compatibility fixes and modem performance improvements.
It's worth noting that the Doke OS interface (Blackview's shell) may differ slightly from stock Android. If you can't find the desired option, use the settings search. Tap the magnifying glass at the top of the settings menu and search for "Wi-Fi Calling."
In conclusion, WiFi Calling technology turns Blackview BV9000 Pro into an even more powerful communication tool, allowing you to stay connected where regular phones remain silent. Properly setting priorities and understanding how the IMS profile works will help you avoid connection issues in the future.
Can I use WiFi Calling if I have an old format SIM card (2G/3G)?
Technically, VoWiFi and VoLTE require registration on 4G/LTE networks. If your SIM card is very old and doesn't support 4G, your operator may not allow service activation. We recommend replacing your SIM card with a new one at a carrier store, keeping your phone number.
Does WiFi Calling eat up a lot of battery?
Power consumption when using WiFi Calling is comparable to standard cellular calls, and can sometimes be even lower if the cellular signal is weak (since the phone doesn't need to constantly boost its transmit power). However, if the WiFi signal is unstable, power consumption may increase.
Will WiFi Calling work if I have an ad blocker on my router?
Aggressive ad filters or DNS filters (such as AdGuard at the router level) may block domains required for IMS session registration. If this feature isn't working, try temporarily disabling traffic filtering.
Does this feature work via mobile hotspot (Internet sharing)?
Yes, if you're sharing internet from another phone or router to the Blackview BV9000 Pro, and WiFi Calling is enabled on that device, calls will go through that channel. However, if you're sharing internet With Blackview, then calling via WiFi from other devices connected to it is usually not possible (depending on the operator).