Wi-Fi Calling on iPhone: How to Set Up and Use It Without a SIM Card

Calls via Wi-Fi on iPhone — it's not just a convenient feature, but sometimes the only way to stay connected in areas with poor mobile network coverage. Technology Wi-Fi Calling It allows you to make and receive calls even without an active SIM card (under certain conditions), saving battery life and improving call quality. But how do you set it up correctly, what nuances should you consider when working with different carriers, and why does the feature sometimes stop working? In this guide, we'll cover every step—from basic activation to troubleshooting rare errors.

Many users mistakenly think that for calls on Wi-Fi needed iPhone latest model or special tariff. In fact, the function is supported by most devices starting from iPhone 6 (with updated software) and is available from all major Russian operators. The main thing is to configure the network correctly and take into account any limitations. For example, When roaming, Wi-Fi Calling can only work when connected to domestic networks, and is often blocked abroad..

Below you'll find step-by-step instructions for various scenarios: from standard setup to using the feature without a SIM card or with two SIM cards. And if something goes wrong, there's a section with troubleshooting tips and answers to frequently asked questions at the end of the article.

1. Which iPhones support Wi-Fi calling?

Function Wi-Fi Calling available on all iPhone, starting with the model iPhone 6, but with important caveats:

✅ Supported models (subject to updating to the latest version of iOS):

• 📱 iPhone 6/6 Plus and newer (including SE 1st generation)
• 📱 All models iPhone 7/8/X series
• 📱 iPhone 11/12/13/14/15 (including Pro/Max and SE 2/3rd generation)

⚠️ Important: On iPhone 6/6S The function may not work stably due to an outdated Wi-Fi module. Apple does not officially guarantee support for these models in new versions of iOS.

🔄 Software update: To activate Wi-Fi Calling required iOS 12 or newer. You can check the version in Settings → General → About. If your iPhone It hasn't been updated for a long time, first install the latest firmware.

2. How to enable Wi-Fi Calling on iPhone: step-by-step instructions

Activating the function takes no more than a minute, but requires fulfilling several mandatory conditions:

• 📶 Connect to a stable network Wi-Fi (preferably with a speed of 5 Mbps)
• 📱 A SIM card from a carrier that supports the technology (list below)
• 🔒 The phone is in disabled mode Airplane mode

Instructions for switching on:

1. Open Settings → Cellular communications (or Mobile communications).
2. Select an item Wi-Fi Calling (on some models it is hidden - see spoiler below).
3. Activate the switch Wi-Fi Calling on this iPhone.
4. Confirm your address for emergency services (required for Russia).
5. Wait for an SMS from your operator confirming activation (this does not always happen).

Don't see the Wi-Fi Calling option in the settings?

If the item is missing, check:

1. Your operator supports the function (list below).

2. The SIM card is activated and not blocked.

3. In Settings → General → About The operator is specified, not "Unidentified network".

4. Try restarting your phone or resetting network settings (Settings → General → Transfer or Reset iPhone → Reset Network Settings).

⚠️ Attention: After activation, the following message will appear in the status bar next to the operator’s name: Wi-Fi or Wi-Fi CallingIf it's not there, but the function is enabled, check your network connection.

3. List of operators supporting Wi-Fi Calling in Russia

Not all mobile operators provide the ability to make calls Wi-FiAs of 2026, the feature is officially available on the following providers:

🔹 How to check your carrier's support:

1. Call the short number:
   • MTS: *111*0887#
   • Beeline: *110*180#
   • Megaphone: *505#
   • Tele2: *155*1#

Or send a USSD request *111# and find information about Wi-Fi Calling in response.

⚠️ Attention: If you use eSIM, make sure your operator profile supports Wi-Fi CallingSome virtual SIM cards (for example, from Tinkoff Mobile) may not provide this feature.

4. Wi-Fi calling without a SIM card: is it possible?

Technically Wi-Fi Calling It's tied to a SIM card, but there are workarounds for making calls without a physical card:

🔸 Method 1: Using eSIM

• 📲 Activate eSIM your operator (supported on iPhone XS and newer).
• 🔄 Turn on Wi-Fi Calling As usual, the function will work through a virtual SIM.

🔸 Method 2: Call forwarding

• 📞 Set up call forwarding from another phone (with a SIM card) to yours iPhone through Settings → Phone → Call Forwarding.
• 🔊 Calls will be received via Wi-Fi, but outgoing calls are only through applications (for example, WhatsApp).

🔸 Method 3: VoIP Apps

• 💬 Install Skype, Zoom or Google Voice - They allow you to call regular numbers via the Internet.
• ⚠️ Disadvantage: numbers will be displayed as "unknown" or with an application code.

⚠️ Attention: SIM-free calls via Wi-Fi Calling are impossible - this is a limitation of the technology. All the listed methods are workarounds and may require additional settings or payment (for example, minutes in Skype).

5. Setting up Wi-Fi Calling on an iPhone with Dual SIM Cards

If your iPhone supports Dual SIM (models XS Max and newer), you can activate Wi-Fi Calling for each card separately. Here's how to do it:

Step 1: Select a primary line for calls

1. Open Settings → Cellular.
2. Select Primary SIM card (or Default voice line).
3. Please specify which SIM card to use for Wi-Fi Calling.

Step 2: Activation for the second SIM

1. Return to Settings → Cellular.
2. Select the second SIM card → Wi-Fi Calling.
3. Enable the feature and confirm the address (if required).

📌 Features of working with two SIM cards:

• 🔄 Calls by Wi-Fi will come from the SIM card that is selected as the main one for voice communication.
• 📱 If one of the SIM cards does not support Wi-Fi Calling, the function will be active only for the second one.
• 🔋 Only one SIM card can work in roaming (depending on the operator).

6. Why Wi-Fi Calling Doesn't Work: Common Problems and Solutions

If the feature is activated but calls are not going through, check the following:

🔧 Problem 1: There is no "Wi-Fi" message in the status bar

• 🔌 Solution: Reconnect to the network Wi-Fi or reboot the router.
• 📱 Solution: Turn on and off Airplane mode for 30 seconds.
• 🔄 Solution: Update operator settings: Settings → General → About → Carrier settings.

🔧 Problem 2: Calls are dropped or interrupted

• 📶 Solution: Check your internet speed (should be at least 2 Mbps).
• 🔊 Solution: Turn it off Bluetooth - it may conflict with Wi-Fi Calling.
• 🔄 Solution: Reset network settings: Settings → General → Transfer or reset → Reset network settings.

🔧 Problem 3: The operator does not support the function (although it should)

• 📞 Solution: Call the operator's support team and check whether the service is activated on your number.
• 💳 Solution: Check if your SIM card has been blocked due to non-payment.
• 🔄 Solution: Try reinstalling your operator profile (for MTS And Megaphone).

⚠️ Attention: If after all the manipulations Wi-Fi Calling if it doesn't work, check if it's turned on on yours iPhone Low power mode (Settings → Battery). This feature can limit background activity, including Wi-Fi calling.

7. How to improve the quality of Wi-Fi calls?

Even with a stable connection, call quality can suffer due to interference or incorrect settings. Here's how to optimize it:

📶 Tip 1: Choose the right Wi-Fi frequency

• 🔄 Use the network 5 GHz instead of 2.4 GHz - it is less congested and provides better speed.
• 📡 If the signal is weak, go back to 2.4 GHz - It goes through walls better.

🔊 Tip 2: Configure QoS on your router

• 🖥️ In the router control panel (192.168.0.1 or 192.168.1.1) find the section QoS (Quality of service).
• 🔧 Prioritize traffic for iPhone by MAC address or ports 500-502 (used for Wi-Fi Calling).

📱 Tip 3: Disable background apps

• 🔄 Close all programs that consume the Internet (for example, YouTube or Torrents).
• 📵 Turn on Concentration mode (Settings → Concentration Mode) to limit background activity.

🔋 Tip 4: Check your power saving settings

• ⚡ Turn off Optimizing battery charging (Settings → Battery → Battery Health).
• 🔄 Make sure that in Settings → Battery for the application Telephone background activity is allowed.

8. Frequently asked questions about Wi-Fi Calling on iPhone

❓ Is it possible to make calls over Wi-Fi abroad?

Yes, but with some reservations:

• 🌍 In most countries Wi-Fi Calling Works only when connected to local networks (for example, in a hotel).
• 📵 Some operators (eg. Megaphone) block the function in international roaming.
• 💰 Calls may be charged as international calls - check with your operator.

❓ Why does calling over Wi-Fi use up my mobile data?

This happens if:

• 📶 The Wi-Fi signal is weak, and iPhone automatically switches to the mobile network.
• 🔄 The option is enabled in the settings Cellular data for Wi-Fi (Settings → Cellular → Data Options → Cellular Data for Wi-Fi).
• 📱 The operator does not support Wi-Fi Calling, and the call goes through VoLTE.

🔹 Solution: Turn it off Cellular data for Wi-Fi or reconnect to a more stable network.

❓ How do I disable Wi-Fi Calling?

To deactivate the feature:

1. Go to Settings → Cellular → Wi-Fi Calling.
2. Turn off the switch Wi-Fi Calling on this iPhone.
3. Confirm the action (a reboot may be required).

⚠️ After disabling, all calls will go through the mobile network, even if Wi-Fi is available.

❓ Can I use Wi-Fi Calling on an iPad or Mac?

Yes, but with restrictions:

• 📱 On iPad the function only works if it is linked to the same Apple ID, that and iPhone with activated Wi-Fi Calling.
• 💻 On Mac needs to be turned on Call forwarding V FaceTime settings.
• 📵 Calls will come from the number iPhone, but you can receive them on any device Apple.

❓ Why is there no Wi-Fi Calling option on the iPhone 15?

Possible reasons:

• 📱 The device was purchased abroad and locked to a different operator.
• 🔄 The SIM card is not activated or a virtual operator is used (for example, Lenta Mobile).
• 📵 In the country of purchase iPhone The function is disabled at the firmware level (for example, in China).

🔹 Solution: Check your phone's region in Settings → General → Language and RegionIf the wrong region is specified, reset the settings to factory settings.