Many users are familiar with the situation when their smartphone suddenly stops connecting to their home wireless network. The router's lights seem to be flashing, the internet on other devices seems stable, but your phone stubbornly displays the "Obtaining IP address" error or endlessly spins the connection wheel. This is annoying, especially when you urgently need to check your email or reply to a message.
There can be many reasons for this behavior, ranging from a simple software glitch in the device to complex conflicts in the router's security settings. Often, the problem lies not in hardware failure, but in a software glitch or incorrect address distribution on the local network.
In this article, we'll take a detailed look at why connection problems occur, how to diagnose the problem yourself, and what steps to take to restore normal internet access. We'll cover solutions for both Android, and for iOS, and we will also touch on the settings of the router itself.
Basic diagnostics and hardware rebootThe first thing you should do if you're having any connection issues is reboot your devices. This is a classic tip, but it works 80% of the time, as it clears the network module cache and clears temporary errors. Unplug the router for 10-15 seconds, then plug it back in and wait for it to fully boot up.
At the same time, try rebooting the smartphone itself. If the problem was caused by a frozen network process in the operating system, everything should work again after turning it on. Make sure the module is enabled on the phone. Wi-Fi and the flight mode is activated, which must be turned off to force the antennas to re-adjust.
If a simple reboot doesn't help, check if other devices can see the network. If your laptop or tablet connects without problems, the issue is with your phone's settings. If the network isn't visible anywhere, the router may be frozen or its wireless module may be faulty.
Problems with IP addressing and DHCP serverOne of the most common reasons why a phone won't connect is an IP address issue. The router acts as a DHCP server, automatically assigning unique addresses to all devices on the network. If the address pool is exhausted or a conflict occurs, the phone will not be able to authenticate.
Changing the IP settings on your smartphone itself often helps. By default, they're set to "DHCP," but you can try manually entering a static address. To do this, go to your Wi-Fi network properties and select "Advanced Settings" or "Advanced." Find "IP Settings" and switch it to "Static."
How to correctly set up a static IP address
In the IP address field, enter a value similar to the router's address, but with a different number at the end (for example, if the router is 192.168.0.1, then enter 192.168.0.150 for the phone). Set the gateway and DNS to the same values as the router's address.
In some cases, the problem stems from an overcrowded ARP address table on the router. This happens if there are a lot of devices connected to the network or if there are numerous errors in the logs. In this situation, a full factory reset of the router will help, but this will require reconfiguring the internet.
Conflicts of frequency ranges and channelsModern routers often operate in two ranges: 2.4 GHz And 5 GHz. Older phones may not see the 5 GHz network, while newer ones may try to connect to the crowded 2.4 GHz band, ignoring the available 5 GHz. Make sure your phone supports the frequency your router broadcasts on.
Another common cause is channel interference with neighboring routers. If everyone in an apartment building uses the same channel (for example, 6 or 11), interference occurs. The phone sees the network, but the connection is constantly dropped or fails altogether due to the high noise level.
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To resolve this issue, you need to log into the router's web interface. This is usually done at 192.168.0.1 or 192.168.1.1. In the wireless network section (Wireless) try changing the channel from “Auto” to a specific number (1, 5 or 11 for 2.4 GHz).
Password and security settings errorsA trivial but extremely common error is an incorrect password. The phone may not display "Incorrect password," but simply try to connect endlessly or return the error "Failed to connect." Carefully check your keyboard layout, letter case, and any extra spaces.
It's also worth paying attention to the encryption type. Modern security standards, such as WPA3, may not be supported by older phone models. If the router is configured only for WPA3, the older device simply won't be able to authenticate.
⚠️ Important: If you changed the password on your router, be sure to "Forget Network" on your phone before re-entering the new information, otherwise the device will use the saved encryption keys.
The table below lists the main security types and device compatibility:
| Security type | Description | Compatibility |
|---|---|---|
| WPA2-Personal (AES) | The standard, most compatible option | All modern devices |
| WPA3-Personal | A new standard of enhanced protection | Only new smartphones (after 2018-2019) |
| WPA/WPA2 Mixed | Compatibility mode for older gadgets | Versatile, but less secure |
| WEP | An outdated and insecure protocol | Very old devices, not recommended |
The Impact of MAC Filtering and Hidden NetworksYour network administrator may have enabled MAC filtering. This is a security mechanism that only allows connections to devices with specific physical addresses. If your phone isn't on the whitelist, the router will reject the connection request, even if the password is entered correctly.
You can only check this by going into your router settings. Find the section Wireless MAC Filtering or "MAC Address Filter." If this feature is enabled, you'll need to find your phone's MAC address (under "About Phone" -> "General Information") and add it to the allowed list.
Hidden networks (SSIDs) are also worth mentioning. If the router doesn't broadcast the network name, your phone won't be able to connect automatically. You'll have to manually add the network by entering the name (SSID) down to the last character. The slightest mistake in the name will result in connection failure.
Operating system and driver failuresSometimes the problem lies deeper—in the smartphone's operating system itself. Accumulated errors in network settings, bugs after an OS update, or conflicts with third-party apps (such as VPNs or antiviruses) can block the Wi-Fi module.
Try resetting your network settings. This won't delete your personal files or contacts, but it will clear all saved Wi-Fi passwords, Bluetooth settings, and mobile network settings. Android It's located in the menu "System" -> "Reset" -> "Reset Wi-Fi, mobile data, and Bluetooth settings".
What to do if resetting the network doesn't help
Try starting your phone in safe mode. If Wi-Fi works stably in this mode,
ilno, then the problem is caused by one of the applications you have installed.
In rare cases, a firmware update for your router or phone may be required. Manufacturers often release patches to fix compatibility issues with certain Wi-Fi chips. Check your device settings for updates.
Hardware failures of communication modulesIf software solutions don't help, a hardware problem can't be ruled out. Impacts, drops, or exposure to moisture could have damaged the antenna module inside the phone. If the phone can't detect any Wi-Fi networks around it (even neighbors'), even though it did before, this is a warning sign.
Overheating may also be the cause. Under prolonged load or in bright sunlight, the wireless module may shut down for protection. Allow the device to cool and then test again. If the problem persists only when overheating, the thermal paste may need to be replaced or serviced.
⚠️ Attention: The settings interfaces and menu item names may differ depending on the router model (TP-Link, Asus, Keenetic) and the phone's operating system version. Always check the manufacturer's official documentation.
Frequently Asked Questions (FAQ)
Why does my phone say "Obtaining IP address" and then turn off?
This means the phone successfully authenticated with the password, but the router can't allocate a free address from the DHCP pool. Try rebooting the router or entering a static IP address in the Wi-Fi settings on your phone.
Can antivirus software block Wi-Fi connections?
Yes, some antivirus protection features (such as "Public Network Protection" or the built-in firewall) can block connections if the network is unsecured. Try temporarily disabling your antivirus to test.
What should I do if my phone sees the 5 GHz network but doesn't connect?
Your router may be configured for channels that aren't supported in your region (for example, 5 GHz channels above 140). Go to your router settings and select a channel range allowed for your region, or change the channel width to 20/40/80 MHz.
Does resetting network settings delete my photos and contacts?
No, reset network settings (Network Reset) only affects connection settings: Wi-Fi passwords, Bluetooth pairings, and mobile network settings. Your personal data (photos, contacts, apps) will remain intact.