Why Wi-Fi isn't working on Android: A complete guide to diagnostics and repair

Have you enabled Wi-Fi on your smartphone, but the internet isn't showing up, even though it works on other devices? Or is the network constantly disconnecting, and the speed drops to zero? Are you having problems with your wireless connection? Android — one of the most common user complaints. The causes can lie in the phone's settings, router issues, ISP problems, or even physical interference.

In this article we will look at all possible reasons, which causes Wi-Fi to stop working Android-devices—from basic connection errors to deep firmware failures. You'll learn how to diagnose the problem in 2 minutes, which settings to check first, and what to do if none of the standard methods help. And for owners of older smartphones (Samsung Galaxy S8, Xiaomi Redmi Note 5 etc.) we will give unique solutions for hardware limitations, which are not written about in official instructions.

Important: If your phone not only fails to connect to Wi-Fi, but also overheats, discharges in an hour or reboots spontaneously when trying to turn on the network - these are signs of a serious malfunction. In this case, first check the sections about hardware failures And firmware failures.

1. Basic checks: what to do first

Before digging deep into the settings Android or router, make sure the problem isn't something obvious. In 60% of cases, Wi-Fi issues are caused by these issues.

• 🔌 Check the router's power supplyIf the lights on your router are off or flashing red, the device may be turned off or broken. Try rebooting it using the power button. Reset (not to be confused with a full reset!).
• 📶 Make sure Wi-Fi is turned on on your phone.: Sometimes users accidentally turn off the network through the notification panel or mode On the planeYou can check it in Settings → Connections → Wi-Fi.
• 🔒 The network password is entered correctly.If you recently changed the password on your router but forgot to update it on your phone, you won't be able to connect. Delete the network in the settings and add it again.
• 📱 Restart your phone: It sounds trivial, but resetting the system data can often solve problems with Wi-Fi drivers. This is especially true for Samsung And OnePlus after updates.

If Wi-Fi still isn't working after these steps, proceed to the next section. If the network is back online, but the speed is slow or the connection is unstable, read on. signal optimization.

⚠️ Attention: On some firmware (for example, MIUI 14 on Xiaomi) After the update, the Wi-Fi connection priority may reset. To fix this, go to Settings → Wi-Fi → Advanced → Network Priority and select Wi-Fi is preferable to mobile data.

2. Router-side problems: how to identify and fix them

If Wi-Fi is not working only on your Android-device, but everything works fine on your laptop or other phone, the problem is most likely with your smartphone. But if the internet connection drops on all devices at once, the router or ISP is to blame. Here's how to check:

1. Connect your phone to a different network (For example, to a mobile hotspot or Wi-Fi in a cafe). If the internet works, the problem is with your router.
2. Check the indicators on the router:
   • 🟢 Green/blue Wi-Fi — the network is active.
   • 🔴 Red Internet - no connection to the provider.
   • 🟡 Yellow flashing LAN/WAN - problems with the cable or port.

Reboot your router (Unplug the power cord for 30 seconds.) This will flush the DHCP cache and often resolve issues with IP address distribution.

If Wi-Fi works after rebooting, but disappears again after a while, it might be the router overheats or its firmware is outdated. In this case:

• 🌡️ Check the temperature of the router case. If it's hot, provide ventilation (don't place it in a closed cabinet).
• 🔄 Update your router firmware via the web interface (usually at 192.168.0.1 or 192.168.1.1).
• 📡 Change the Wi-Fi channel in the router settings (it is recommended to use 1, 6 or 11 for 2.4 GHz and 36-48 for 5 GHz).

⚠️ Attention: If your router issues IP addresses in the range 169.254.x.x — this is a sign of a DHCP failure. Temporarily assign a static IP on your phone manually (in the Wi-Fi network settings, select Advanced → IP Settings → Static and enter your network details).

3. Android Settings: What Could Go Wrong

If the router is working properly, but the Wi-Fi on your phone still won't turn on or is unstable, the problem lies in the settings. AndroidLet's look at the most common scenarios:

3.1. Resetting network settings

The fastest way to restore Wi-Fi functionality is to reset your network settings. This will delete all saved networks, VPNs, and mobile data settings, but will not affect your personal data. Here's how:

1. Open Settings → System → Reset (on some phones the path may be different: Settings → General → Reset).
2. Select Reset network settings (or Reset Wi-Fi, mobile network, and Bluetooth).
3. Confirm the action and restart your phone.

3.2. Date and time errors

If your phone's date and time are incorrect, it may block your connection to some networks (especially corporate networks or those with security certificates). Check:

• 🕒 Go to Settings → System → Date & Time.
• 🔄 Enable options Automatic date and time detection And Automatic time zone detection.
• 🌍 If automatic detection does not work, set the time manually.

3.3. Background activity restrictions

On phones with aggressive battery optimization (eg. Xiaomi, Huawei, Oppo) the system may be blocking Wi-Fi in the background. To fix this:

• 🔋 Log in Settings → Battery → Power saving mode and turn it off.
• 📵 In your Wi-Fi network settings, disable the option Turn off when idle (if any).
• 🛑 For MIUI: open Settings → Applications → Manage applications → Three dots (menu) → Special permissions → Autostart and enable autostart for Wi-Fi settings.

3.4 IP address conflict

If two devices on your network receive the same IP address, this can cause connection issues. To fix this:

1. Go to your Wi-Fi network settings on your phone.
2. Click Additionally (or IP settings).
3. Select Static instead of DHCP.
4. Enter an IP address that is not in use by other devices (e.g. 192.168.0.100, if the router distributes addresses with 192.168.0.1).
5. Please specify gateway (192.168.0.1), subnet mask (255.255.255.0) and DNS (for example, 8.8.8.8 And 8.8.4.4 for Google DNS).

4. Firmware failures: when software is to blame

If Wi-Fi stops working after an update Android or firmware via ODIN/Fastboot, the problem is most likely software-related. Here are typical symptoms:

• 🔄 Wi-Fi turns on, but immediately turns off.
• 📵 The following message appears in the network settings: Error or Saved, WPA/WPA2 protection.
• 🔍 In the system logs (application Logcat) there are errors of the type wpa_supplicant: Failed to connect.

Solutions depend on the cause:

4.1. Factory reset

If the crash occurred after an update, try resetting your phone to factory settings. Attention: This will delete all data from your device, so make a backup first.

1. Go to Settings → System → Reset.
2. Select Erase all data (factory reset).
3. Confirm the action and wait for the reboot.

4.2. Flashing via Recovery

If the reset doesn't help, the system area responsible for Wi-Fi may be damaged. In this case, a firmware update will help. Recovery:

1. Download the official firmware for your model from the manufacturer's website (for example, Samsung — Sammobile, Xiaomi — Xiaomi Firmware Updater).
2. Place the firmware file (usually in the format .zip) to the root of the phone's memory.
3. Turn off your phone and press the key combination to enter Recovery (For example, Power + Volume Up For Samsung).
4. Select Apply update from SD card (or similar item) and specify the downloaded file.
5. Wait for the process to complete and reboot your device.

⚠️ Attention: On some phones (Huawei, Honor) after reflashing, you may need to reactivate it through official services (for example, HiSuite). Without this, Wi-Fi and mobile networks will not work.

What should I do if Wi-Fi still doesn't work after flashing the firmware?

If flashing the firmware doesn't help, the Wi-Fi module may be damaged at the hardware level. In this case, the only solution is to have the motherboard or Wi-Fi chip replaced at a service center. This is especially true for phones that have been dropped in water or subjected to strong impacts.

4.3. Rolling back an update

If problems started after an automatic update Android, you can try rolling back to a previous version. To do this:

• 📥 Download the older firmware version (for example, from the forum) 4PDA or XDA Developers).
• 🔧 Install it via Fastboot or ODIN (For Samsung).
• ⚠️ Please note that rolling back may result in a locked bootloader on some models (Pixel, OnePlus).

5. Hardware failures: when to take your phone to a service center

If none of the software methods helped, the problem may be in physical malfunction phone components. Here are the signs of hardware failure:

• 🔌 Wi-Fi does not turn on at all (the button is gray and does not respond to pressing).
• 📡 The message appears in the network settings Error or Unable to turn on Wi-Fi.
• 🔥 The phone overheats in the antenna area (usually the top of the case).
• 💧 Before the breakdown, the phone was dropped, got wet, or was exposed to strong vibrations.

The most common hardware reasons are:

If you suspect a hardware failure, Do not try to disassemble the phone yourself. — this could make the problem worse. It's best to contact a service center. Average repair cost:

• 🔧 Replacing the Wi-Fi antenna: 1 500–3 000 ₽.
• 🔥 Chip re-soldering: 3 000–6 000 ₽.
• 💧 Cleaning after moisture contact: 2 000–5 000 ₽.

⚠️ Attention: On phones with a non-separable case (iPhone, Samsung Galaxy S22 and newer) replacing the Wi-Fi antenna often requires complete disassembly of the device, which increases the repair cost to 8 000–12 000 ₽.

6. Slow Speed ​​and Unstable Connection: How to Speed ​​Up Wi-Fi

If Wi-Fi connects, but the speed is slower than expected or the connection keeps dropping, the problem may be:

• 📶 Overloaded router channel (many neighboring networks on one channel).
• 📱 Restrictions from the side Android (for example, traffic saving mode is enabled).
• 🔄 Suboptimal DNS settings.
• 🛡️ VPNs or firewalls that block traffic.

Here's how to fix it:

6.1 Changing the Wi-Fi channel and standard

If your router is on a busy channel, your speed will be low. To find a free channel:

1. Install the application on your phone WiFi Analyzer (available in Google Play).
2. Run a scan and the app will show you which channels are busy.
3. Go to your router settings (192.168.0.1 or 192.168.1.1) and change the channel to a free one.
4. If your router supports 5 GHz, switch to this range - it is less crowded.

6.2. DNS optimization

Sometimes slow speeds are caused by your provider's slow DNS servers. To fix this:

1. Go to your Wi-Fi network settings on your phone.
2. Click Advanced → IP Settings.
3. Select Static and enter:

DNS 1: 8.8.8.8
DNS 2: 8.8.4.4

4. Save your settings and reconnect to the network.

6.3. Disabling VPN and firewalls

Some VPN services and antiviruses (for example, Kaspersky, Avast) may limit Wi-Fi speed. To check:

• 🔌 Temporarily disable the VPN in the app settings.
• 🛡️ Go to Settings → Applications and pause the antivirus.
• 📈 Check your speed via Speedtest - If it has grown, the problem is in one of these services.

6.4. Configuring QoS on a router

If you have many Wi-Fi-connected devices at home (smart TVs, laptops, smart speakers), your router may be artificially limiting the speed for some devices. To fix this:

1. Log into your router's web interface.
2. Find the section QoS (or Quality of service).
3. Disable QoS or manually set the priority for your phone's MAC address.

7. Specific problems of popular models

Some phones have unique Wi-Fi bugs related to their hardware or firmware. Let's look at the most common cases:

7.1. Samsung Galaxy (One UI)

On phones Samsung (especially the series Galaxy S And Note) the following problems are often encountered:

• 🔄 "Wi-Fi turns off when the screen is locked" - enable in settings Settings → Connections → Wi-Fi → Three dots → Advanced → Connect to Wi-Fi during sleep → Always.
• 📵 "Can't connect to 5GHz networks" - update the firmware or reset the network settings.
• 🔥 Overheating and Wi-Fi disconnection - check the phone's operation without a case (especially relevant for Galaxy S21 Ultra).

7.2. Xiaomi (MIUI)

On Xiaomi And Redmi Common complaints include:

• 📡 "Wi-Fi connects, but the internet doesn't work." - disable it in the settings Settings → Wi-Fi → Advanced → Automatically switch to mobile data.
• 🔒 "Authentication Error" - delete the network, restart your phone and reconnect.
• 📉 "Slow speed on MIUI 12/13" - reset your network settings or roll back to MIUI 11.

7.3. Google Pixel

On Pixel (especially models Pixel 4–Pixel 6) are found:

• 🔄 "Wi-Fi disconnects when signal strength is low" — turn it off Settings → Network & Internet → Wi-Fi → Wi-Fi settings → Automatically connect to open networks.
• 📵 "Can't see the 5 GHz network" - update the firmware or reset the network settings.
• 🛠️ "Crash after Android update" - Perform a factory reset.

7.4 Huawei and Honor

On phones Huawei And Honor (especially with EMUI 10+) typical problems:

• 🔒 "IP configuration error" - assign a static IP manually.
• 📡 "Cannot connect to hidden networks" - Add the network manually in the Wi-Fi settings.
• 📵 "Wi-Fi only works near the router." - check the antenna (a common problem after falls).

8. Frequently asked questions and answers

❓ Why does Wi-Fi work on other devices but not on my Android?

If your router is distributing internet, but your phone isn't connecting, the problem is most likely in the settings. Android or hardware failure. Check:

1. Is the network password entered correctly?
2. Is the mode not enabled? On the plane.
3. Is the connection blocked by an antivirus or VPN?
4. Is the Wi-Fi antenna damaged (if the phone was dropped or got wet).

If nothing helps, try resetting your network settings or updating your firmware.

❓ How do I know if the problem is with the router and not the phone?

Connect another device (laptop, tablet) to the same network. If the internet works, the problem is with your phone. If not, the router or ISP is to blame. Also, check the router's indicator lights:

• 🟢 Wi-Fi On – the network is active.
• 🔴 Internet does not light up - there are problems with the provider.
• 🟡 LAN/WAN blinking - there may be problems with the cable.

❓ Is it possible to fix Wi-Fi on my phone myself?

If the problem is software-related (settings glitch, firmware error), then yes, you can reset the settings, reflash the phone, or update the software. However, if the problem is hardware-related (damaged antenna, chip failure), you won't be able to repair the phone without specialized equipment and skills. In this case, it's best to contact a service center.

❓ Why does Wi-Fi turn off when I lock the screen?

This is a standard battery saving feature on most phones. To disable it:

• On Samsung: Settings → Connections → Wi-Fi → Three dots → Advanced → Connect to Wi-Fi during sleep → Always.
• On Xiaomi: Settings → Wi-Fi → Advanced → Connect to Wi-Fi in sleep mode → Always.
• On clean Android: Settings → Network & Internet → Wi-Fi → Wi-Fi settings → Connect to networks during sleep → Always.

If the option is missing, check your battery settings - it's possible that Wi-Fi is in optimization mode.