Why Wi-Fi isn't working on my phone: A complete breakdown of the causes and solutions

Please pay special attention to Wi-Fi channelIf the router is operating on the channel 13 or 14, some phones (especially older models iPhone (or US devices) may not see it. Switch channels. 1–11 in the router settings.

Check the indicators on the case|Reboot the router (turn it off for 2 minutes)|Make sure Wi-Fi is not disabled by the button on the case|Try connecting to the router via cable (if possible)-->

⚠️ Note: If you have a dual-band router (2.4 GHz + 5 GHz), try connecting to the network 5G (its name usually ends in _5G). Some phones (for example, iPhone 6/6S) do not support 5 GHz frequency, but this is rare for modern devices.

3. IP address conflicts and DHCP settings

If your phone connects to Wi-Fi, but the internet doesn't work (there's an exclamation mark next to the network icon), the problem may be IP address conflictThis happens when the router assigns your phone an address that is already taken by another device.

How to check:

1. On Android: go to Settings → Wi-Fi, tap on your network and select Network Management → Advanced. Look at the field IP address.
2. On iOS: go to Settings → Wi-Fi → (i) next to the network and check the section IPv4 address.

If the IP address starts with 169.254 (For example, 169.254.100.5), this means that the router's DHCP server was unable to issue a valid address. Solutions:

• 🔄 Restart your router and phone.
• 📱 Forget the network on your phone (Settings → Wi-Fi → Forget this network) and reconnect.
• 🖥️ In the router settings, check if DHCP is enabled (section LAN → DHCP Server).

Symptom	Probable cause	Solution
There is a connection, but the Internet doesn't work.	IP conflict or DHCP failure	Restart your router and forget the network on your phone.
The phone doesn't see the network, although it exists.	Hidden SSID or incompatible channel	Enable SSID visibility, change channel to 1–11
Constant connection breaks	Interference from other networks or weak signal	Change the channel on your router and move your phone closer to the router.
Wi-Fi works, but it's very slow.	Network congestion or ISP throttling	Switch to 5 GHz and check your plan with your provider.

4. Phone firmware failures: when a reset helps

If Wi-Fi doesn't work only on one phoneIf your device connects normally, but other devices connect normally, the problem may be software-related. Common culprits include:

• 🤖 Crash after Android/iOS update (especially relevant for beta versions).
• 🧹 Clogged cache network settings.
• 🔧 Incorrect power saving settings, disabling Wi-Fi in the background.

Step by step instructions for Android:

1. Go to Settings → System → Reset settings.
2. Select Reset Wi-Fi, mobile network, and Bluetooth settings.
3. Confirm the action and restart your phone.

For iPhone:

1. Open Settings → General → Transfer or reset iPhone.
2. Tap Reset → Reset network settings.
3. Enter your password and wait for the reboot.

⚠️ Warning: Resetting your network will delete all saved Wi-Fi passwords! Prepare a list of them in advance if you don't remember them by heart.

5. Interference and physical obstacles: why the signal disappears

Wi-Fi uses radio waves and is susceptible to interference. If your network was previously working fine but is now constantly dropping out or slowing down, check:

• 📡 Distance to the routerConcrete walls or metal partitions weaken the signal. The optimal distance is no more than 10 meters in a direct line of sight.
• 🔌 Sources of interference:
  • Microwave ovens (operate at 2.4 GHz).
  • Wireless headphones or speakers.
  • Neighboring Wi-Fi networks on the same channel.
• 🌐 Network congestion: If more than 10 devices are connected to the router, the speed may drop.

How to improve the signal:

1. Move the router to the center of the apartment, raise it higher (for example, on a closet).
2. Change the Wi-Fi channel in your router settings (use apps like Wi-Fi Analyzer for Android to find the freest channel).
3. If the router supports MU-MIMO or Beamforming, enable these features - they optimize the signal for multiple devices.

6. MAC address blocking or router restrictions

Some routers are configured so that only devices with allowed MAC addressesIf your phone has never connected to this network before, its MAC address may have been locked automatically (for example, due to multiple unsuccessful password attempts).

How to check:

1. Find out your phone's MAC address:
   • On Android: Settings → About phone → General information → Wi-Fi MAC address.
   • On iOS: Settings → General → About → Wi-Fi Address.

Also check if the following are enabled in your router:

• 🔒 Guest network with limited access (sometimes phones automatically connect to it instead of the main one).
• ⏰ Access schedule (for example, Wi-Fi may be turned off at night).
• 📥 Device restrictions (maximum number of connections).

⚠️ Attention: On some routers (for example, TP-Link or ASUS) function MAC Filtering It's disabled by default, but you may have enabled it manually. If you're not the network administrator (for example, connecting to Wi-Fi at your office or a friend's house), check this.

7. ISP Problems: How to Distinguish from a Router Failure

If Wi-Fi isn't working on any device (including your phone), the problem may be with your internet service provider. Here's how to check:

• 🌍 Connect your phone to mobile data (3G/4G/5G) and check if websites can open. If so, the problem is definitely Wi-Fi.
• 🖥️ Connect your computer or laptop to the router via cableIf the internet works, the router's Wi-Fi module is to blame.
• 📞 Call your provider and ask about widespread outages in your area (the support number is usually listed on your receipt or on the company's website).

Typical problems with the provider:

• 🔌 Cable break on the line.
• 📉 Traffic limit exceeded (relevant for tariffs with restrictions).
• 🔄 Technical work (usually planned at night, but sometimes they drag on).

8. Hardware malfunctions: when you can’t do without service

If you've tried all the tips and your Wi-Fi still isn't working, the problem might be physical damageSigns of hardware failure:

• 📱 The phone doesn't detect it not a single one Wi-Fi network (even in public places).
• 🔍 A message appears in the Wi-Fi settings Error or Failed to turn on Wi-Fi.
• 🔧 After a fall or exposure to water, Wi-Fi stopped working (even if the screen is intact).

What could have broken:

If you suspect a hardware failure, Do not try to disassemble the phone yourself. This could cause further damage. Contact a service center, making sure you've backed up all your data first (in case you need to reset or replace the motherboard).

⚠️ Attention: On phones with a non-separable case (for example, iPhone or Samsung Galaxy S (series) self-replacement of the Wi-Fi module almost always leads to loss of tightness and voiding the warranty.

FAQ: Frequently asked questions about Wi-Fi not working on your phone