In dense urban environments or when working in offices with thick walls, a standard cellular signal often struggles to cope. It's in these situations that Apple smartphone owners wonder how to make calls over MTS Wi-Fi on an iPhone to ensure a stable voice connection. VoWiFi (Voice over Wi-Fi) technology allows voice traffic to be transmitted over an internet connection, bypassing weak base station coverage areas.
For MTS subscribers, this feature is available by default, but requires proper device configuration. Unlike messaging apps, Wi-Fi calls are made from your primary number, and the other person won't notice the difference. This isn't just an alternative, but a complete replacement for cellular service in areas where cellular coverage is poor but wireless internet access is available.
Before you begin setting up, you need to make sure your tariff plan supports this option. MTS VoWiFi This feature is typically enabled automatically for most modern plans, but in rare cases, it may need to be activated in your personal account. The main requirement is a working internet connection on the access point to which the phone is connected.
Checking compatibility and requirements
The first step is to verify the technical capabilities of your device. Not all iPhone models support VoWiFi on Russian carriers, although most modern gadgets already have built-in support. You'll need a device starting from the model iPhone 5c and newer, running iOS version 13.0 or later.
It is critically important that your smartphone is up to date. operator settingsThese settings contain the configuration profiles that "allow" the phone to switch to voice transmission over the internet. If the settings are outdated, the feature may simply not appear in the menu, even if the phone technically supports it.
⚠️ Important: Make sure your SIM card isn't too old. If you're using a card issued more than 5-7 years ago, it may not support the modern security protocols required for VoWiFi. In this case, you'll need to have your SIM replaced at a mobile phone store.
It's also worth noting that for the technology to work correctly, data roaming must be enabled in your cellular settings, even if you're in your home region. This is a standard protocol requirement for voice traffic authorization.
Activating the feature in iOS settings
The process for enabling Wi-Fi calling on Apple devices is as standardized as possible, but there are some nuances to the display. The interface may differ slightly depending on the operating system version, but the logic remains the same. Go to the section Settings, then select the item Cellular communications.
In the menu that opens, find the line Wi-Fi callingIf you don't see this option right away, it may be hidden in a submenu or require an operator profile update. After clicking the link, you'll need to activate the slider. Wi-Fi calling, moving it to the "On" position.
☑️ Check before switching on
After activation, the system may request confirmation of your address for emergency services. This is a mandatory requirement of communications regulators: when calling emergency services online, the operator must know your geolocation, as it cannot be determined by cell towers.
On some versions of iOS, an icon may appear next to the carrier name in the status bar. Wi-Fi or an inscription MTS Wi-FiThis indicates that the phone has successfully registered with the operator's network via the Internet and is ready to make calls.
Updating operator parameters
A common reason for the missing toggle is an outdated carrier profile. The iPhone periodically requests configuration file updates, but sometimes this process needs to be initiated manually. To do this, go to Settings → General → About.
On this screen, wait 10-15 seconds. If an update is available, a pop-up window will appear prompting you to update your MTS operator settings. Click Refresh and wait for the process to complete. The phone may reboot.
| Parameter | Meaning / Status | Where to check |
|---|---|---|
| iOS version | 13.0 and above | Settings → General |
| Operator settings | MTS RU 58.0+ (example) | Settings → General → About |
| data roaming | On | Settings → Cellular |
| VoLTE mode | Recommended | Settings → Cellular |
If the automatic update doesn't occur, try removing the SIM card and reinserting it after disconnecting from Wi-Fi. After turning on the phone and the network appears, go to the "About this device" section again. Often, a change in network status triggers the configuration request.
What to do if the update does not arrive?
If the pop-up doesn't appear, try resetting your network settings. Go to Settings → General → Transfer or reset iPhone → Reset → Reset network settings. This won't delete your data, but it will reset your network settings to factory defaults, after which your phone will request the MTS profile again.
Setting up via a configuration profile
In rare cases, especially on enterprise plans or when using older versions of iOS, manual profile installation may be required. This isn't the standard procedure for most users, but it resolves the issue when standard methods fail.
The profile can be obtained from the MTS subscriber's personal account or requested from technical support. The configuration file has the extension .mobileconfigAfter downloading the file in Safari, the system will prompt you to install the profile. You'll need to enter your lock screen passcode.
It's important to download profiles only from official carrier resources. Installing third-party configuration files can lead to data leaks or unstable phone operation. After installing the profile, be sure to reboot your device.
⚠️ Warning: If the function does not work after installing a profile, do not install other profile versions. Configuration file conflicts can lead to complete loss of connection. Delete all profiles in the section
Settings → General → VPN and device managementand contact support.
Diagnosing connection problems
Even after proper setup, there may be situations where the VoWiFi icon doesn't appear or calls are dropped. First, check your internet connection. A stable voice connection requires a minimum speed, but low latency (ping) is crucial.
Try opening a web page or video in high definition. If the content loads slowly, call quality will also suffer. Also, make sure you're not using public Wi-Fi networks with browser authentication (captive portal), as they often block necessary ports.
- 📶 Weak Wi-Fi signal: Move closer to the router. Wi-Fi calls are susceptible to packet loss.
- 🔒 Port blocking: Administrators may block VoIP protocols on corporate networks. Try switching to your home network.
- ✈️ Airplane mode: Sometimes it helps to briefly turn airplane mode on and off to re-register with the network.
Another reason for failures may be the inclusion of VPNTraffic tunneling often changes your IP address to a foreign one, which can interfere with your MTS number's geolocation. To check, disable your VPN and try making a test call.
Tariffing and roaming
One of the main questions users have concerns the cost of such calls. MTS charges minutes spent over Wi-Fi according to the terms of your main tariff plan. If you have a minute bundle, they will be used from it. If the bundle is exhausted, the standard price per minute applies.
International roaming is especially important. While abroad, Wi-Fi calls to Russian numbers will be charged as incoming and outgoing roaming calls, but will be significantly cheaper than calls made via a foreign carrier's cellular network. However, Wi-Fi calls to local numbers in your host country may incur charges.
It's important to understand the difference between VoWiFi and messaging calls. In the former case, you call a regular number, while in the latter, you call an app account. VoWiFi data is charged from your internet plan (or per-minute billing), not as free access.
Frequently Asked Questions (FAQ)
Will my number be visible when calling via Wi-Fi?
Yes, your number will appear as usual to the person on the other end of the line. VoWiFi technology is transparent to the user. There are no additional digits or changes to the caller ID.
Is it possible to make calls via Wi-Fi if the SIM card is not active?
No. For the technology to work, the SIM card must be active and registered with the operator's network (even if there is no cellular signal). Without a valid SIM card, authorization on the VoWiFi network is impossible.
Does making calls over Wi-Fi use up data?
Voice data usage is minimal, but it's minimal. A minute of HD call consumes about 0.5–1 MB of data. If you have unlimited Wi-Fi, this doesn't matter. If you use mobile data as a hotspot, the data usage will be charged to your mobile plan.
What should I do if the Wi-Fi Call icon disappears after updating iOS?
After major iOS updates, carrier settings may reset. Repeat the update check in the section Settings → General → AboutIf that doesn't help, reset your network settings.