Why Wi-Fi isn't connecting in the metro: technical reasons and solutions

Are you used to using free Wi-Fi in the metro, but suddenly you can't connect? This problem is familiar to many commuters: one day the connection works flawlessly, but the next, your phone stubbornly ignores available hotspots. The cause could be either your device or the infrastructure of the metro or your mobile operator.

In this article we will look at all possible reasons, which can cause Wi-Fi to stop connecting in the metro: from trivial errors in smartphone settings to technical issues on the provider's end. You'll learn how to diagnose the problem, which parameters to check first, and what to do if standard methods don't help. We'll pay special attention to the specifics of Wi-Fi operation in underground tunnels — here the signal behaves differently than on the surface.

Important: If you use iPhone or Android- device, some of the recommendations will be universal, but some steps will differ. We will highlight these nuances in the relevant sections. Also, keep in mind that Wi-Fi access rules in the metro may vary. vary depending on the city and telecom operator — for example, different authentication technologies are used in Moscow and St. Petersburg.

1. Problems with the SIM card or tariff

The first thing to check is whether your mobile operator is blocking Wi-Fi access in the metro. Many people forget that connecting to the free metro networks requires active SIM card with a positive balanceEven if you have an unlimited data plan, some operators suspend access to additional services (including public Wi-Fi) when your balance reaches zero or negative.

How does it work technically? When you connect to Wi-Fi in the metro, the system verifies your phone number via SMS gateway or USSD requestIf the SIM card is blocked, not identified on the network, or is linked to a different region, authentication will fail. This also applies to virtual operators (e.g., Tele2, Yota, Tinkoff Mobile), which may not support metro roaming.

• 📱 Check your balanceSend a USSD request to *100# or *111# (depending on your operator). If your balance is negative, top up your account by at least 10–20 rubles.
• 🔄 Restart your SIM card: Remove it from the phone, clean the contacts with a dry cloth, and reinsert it. Sometimes resetting the network settings in the menu helps. Settings → Mobile network → Reset settings.
• 🌍 Make sure you have the correct regionIf you recently traveled to another city, your SIM card may be stuck on a different network. Manually select your carrier in the settings.

⚠️ Warning: If you use eSIM, the problem may be related to the carrier profile. Try reinstalling the eSIM through the official app (for example, MTS Connect or Beeline.Profile).

2. Errors in the Wi-Fi settings on the phone

Often it is not the Wi-Fi in the metro itself that is to blame, but incorrect settings of your deviceFor example, a phone may "forget" a network after a firmware update or automatically connect to another point with a weaker signal. Let's consider typical scenarios:

• 🔗 Automatic connection to "junk" networks: if the option is enabled in the settings Automatic connection to open networks, the phone may cling to weak points instead of the main metro network (for example, _Free_WiFi_MosMetro).
• 🔒 Incorrect security type: some phones (especially Xiaomi or Realme) reset Wi-Fi security settings after reboot. Check that the network type for the metro is set to WPA2-Enterprise or 802.1X.
• 📵 Airplane mode or power saving: Even if Wi-Fi is on, aggressive power saving settings (for example, in MIUI or EMUI) may disable the network in the background.

How to fix:

1. Open Settings → Wi-Fi and delete the metro network (click on it and select "Delete" or "Forget").
2. Turn on the mode Advanced settings (if any) and disable the options Auto-connection And Smart switching.
3. For Android: go to Settings → System → Reset → Reset Wi-Fi, mobile network, and Bluetooth settings.
4. For iPhone: reset network settings in Settings → General → Transfer or reset iPhone → Reset → Reset Network Settings.

3. Technical failures on the metro side

If Wi-Fi doesn't work for all passengers in a train car, the problem is most likely with the infrastructure. The metro uses specialized access points with support for roaming between stations, and their operation depends on:

• 📡 Communication breakdown between carsOn trains with Wi-Fi, antennas are mounted on the roof of the train. If the connection between cars is disrupted (for example, due to icing of the contacts in winter), the signal is lost.
• ⚡ Power outagesAccess points in tunnels are powered by separate lines. If substations fail, Wi-Fi may be down for hours.
• 🔧 Hardware updates: the metro periodically modernizes its networks (for example, the transition from Wi-Fi 4 on Wi-Fi 6). During such work, the connection may be unavailable.

How to check:

Pay attention to the Wi-Fi indicators in the car (usually these are LEDs on the ceiling near the doors). If they flashing red Or if the lights aren't lit at all, the problem is definitely on the metro side. You can also ask other passengers or station staff (for example, those on duty at the turnstiles).

⚠️ Please note: in some cities (for example, in Kazan or Nizhny NovgorodWi-Fi in the metro is not provided directly, but through local providers. They may have their own maintenance work that the metro doesn't report. Check these companies' websites for more information.

4. MAC address blocking or device restrictions

Many people don't know that the metro can operate MAC address restriction devices. This is a security measure that prevents abuse of free Wi-Fi (for example, sharing internet with other devices or using a VPN to bypass restrictions). If you connected to the metro network from multiple devices or consumed too much data, your MAC address could be temporarily blocked.

How does this manifest itself:

• The network is visible, but when connecting it gives an error Authentication failed or Unable to obtain IP address.
• Wi-Fi connects but disconnects after a few seconds with a notification Network without internet access.
• On some devices (for example, tablets) the network connects, but not on the phone.

Solutions:

1. Change the MAC address (only for Android with root rights or through ADB):

   adb shell ip link set wlan0 down
   adb shell ip link set wlan0 address XX:XX:XX:XX:XX:XX
   adb shell ip link set wlan0 up

   Instead of XX:XX:XX:XX:XX:XX Specify a new MAC (you can generate one Here).

2. Connect from another device (for example, a second phone) and check if Wi-Fi is working.
3. If the blocking is permanent, please contact the metro support team through the official website or social media.

How to check your MAC address?

On Android: go to Settings → About phone → General information → Status → Wi-Fi MAC address.
On iPhone: Settings → General → About → Wi-Fi Address.
On Windows (if you are distributing the Internet from a laptop): run it in the command line ipconfig /all and find the line Physical address.

5. Conflict with VPN, firewall, or antivirus

If you use VPN, firewall or antivirus with network protection, they can block Wi-Fi connections in the subway. The fact is that public networks are often blacklisted due to suspicious activity by other users. For example:

• 🛡️ Kaspersky Internet Security or Avast may block protocol authentication EAP-SIM, which is used in the metro.
• 🌐 Some VPNs (for example, ProtonVPN or NordVPN) automatically connect to servers abroad, which conflicts with local DNS metro.
• 🔥 Built-in firewall Android 12+ or iOS 15+ may consider the metro network "unsafe" and restrict access to it.

How to diagnose:

1. Disconnect your VPN and try connecting again.
2. Temporarily disable your antivirus or add the Metro network to the exceptions (in the network protection settings).
3. On Android check Settings → Wireless & Networks → Private DNS. If there is an address indicated there (for example, dns.google), reset to Automatically.

6. Phone hardware problems

If Wi-Fi doesn't work only in the metro, but it connects fine at home or in a cafe, the software is most likely to blame. However, if the problems persist everywhere, it's worth checking. hardware:

• 📶 Damaged Wi-Fi antenna: In phones, antennas are located near the top or bottom edge of the case. Impacts or drops can disrupt their operation.
• 🔋 Worn out battery: When the battery level is low (below 15%), the phone may turn off energy-intensive modules, including Wi-Fi.
• 🔌 Oxidation of contacts: If the phone has been in a humid environment (for example, in the subway in winter), the antenna contacts may have oxidized.

How to check:

1. Connect to Wi-Fi in a different location (for example, at a cafe). If the speed is slow or the connection drops constantly, the problem is with your phone.
2. Check your Wi-Fi connection modem mode (Share the internet connection with another phone). If the connection doesn't work, the antenna is to blame.
3. Install a diagnostic app, for example WiFi Analyzer (Android) or Network Analyzer (iOS), and check the signal strength.

⚠️ Warning: If your phone falls in the metro (especially onto the tracks), do not attempt to retrieve it yourself—it could be life-threatening! Contact the station attendant.

7. Firmware updates and factory reset

Sometimes Wi-Fi stops connecting after operating system updatesFor example, after the release Android 14 or iOS 17 Many users have encountered authentication issues on public networks. This is due to tightening security policies (for example, the abandonment of outdated protocols). WPA).

What to do:

• 🔄 Roll back to the previous firmware version (if possible). For Android this is done through fastboot, For iPhone - through iTunes in recovery mode.
• 📲 Reset network settings (See section 2 for instructions for your model).
• 🔧 Manually configure Wi-Fi settings:

  SSID: _Free_WiFi_MosMetro (or similar for your city)
  Security type: WPA2-Enterprise
  EAP Method: SIM
  Phase 2: MSCHAPV2
  CA Certificate: Do not verify (or select "Not specified")
  Identifier: phone number without +7 (e.g. 9123456789)
  Password: leave blank or enter the code from the SMS

If nothing helps, contact your phone manufacturer's support service. Specify that the problem occurs only in the metro - This will help engineers diagnose the cause faster.

Frequently Asked Questions (FAQ)

Why does Wi-Fi connect in the metro, but the internet doesn't work?

This is a typical problem with DNS servers or gateway. Try manually entering DNS (for example, 8.8.8.8 And 8.8.4.4 from Google) in the network settings. Also, check if the mode is enabled Saving traffic in the Wi-Fi settings.

Can I use Wi-Fi in the metro without a SIM card?

No, in most cities (for example, in Moscow or St. Petersburg) authentication is required active SIM card Russian operator. Without it, the system won't let you connect to the network. The exception is some tourist SIM cards or cards from foreign operators with roaming.

Why does Wi-Fi work at the station but disappear in the tunnel?

It is used in tunnels other infrastructure: The signal is transmitted via antennas on the roof of the train. If the connection between cars is disrupted (for example, due to vibration), Wi-Fi may disappear. Also, in tunnels, there are often access points are changing, and the phone does not have time to reconnect.

How to connect to Wi-Fi in the metro with two SIM cards?

The authentication system is tied to phone number, from which you are connecting. If you have two SIM cards, try:

1. Disable the second SIM card in the settings.
2. Use the number of the operator that officially supports Wi-Fi in the metro (for example, MTS or Beeline in Moscow).
3. Restart your phone and reconnect.

What should I do if the metro's Wi-Fi requires a password, but I don't receive an SMS?

This may be due to:

• SMS blocking on your tariff (check in your operator's personal account).
• SMS channel is busy (try again in 1-2 minutes).
• Incorrect number in the profile (for example, if you use eSIM or virtual operator).

Solution: Manually enter your phone number in the authentication field (without the +7) and request the code again. If you still don't receive the SMS, contact your carrier's support team.