A situation where a wired computer or laptop reliably loads pages while a smartphone refuses to connect to a wireless network or is stuck in the "Obtaining IP Address" status is a classic home network issue. This indicates that provider signal The data reaches your equipment, the communication channel with the outside world is working properly, but the internal mechanism for distributing traffic over the radio channel is malfunctioning. Most often, the root cause of the problem lies not in a hardware failure, but in a software conflict with settings or a device memory overflow.
Before you panic and call your provider, it's worth doing some basic checks. equipment diagnosticsIt often happens that the wireless module in a router simply freezes due to prolonged operation without rebooting, while the wired interface (WAN/LAN) continues to function normally. The problem may also stem from incompatible encryption standards or an overcrowded table. DHCP clients, when the router simply cannot give a new address to your phone.
In this article, we'll take a detailed look at all the possible causes of this imbalance between wired and wireless connections. We'll cover frequency range settings, MAC filtering issues, device overheating, and firmware errors. Understanding these nuances will help you quickly restore network access to all your devices. mobile gadgets without calling a specialist.
DHCP address pool overflow and IP conflicts
One of the most common reasons why new devices cannot connect to the network, while older ones (for example, a desktop PC) work, is the exhaustion of the limit of addresses issued DHCP serverThe router has a limited pool of addresses it can distribute to clients (usually from 192.168.0.2 to 192.168.0.254). If numerous guest gadgets, smart light bulbs, or TVs have previously connected to the network and they have been disconnected improperly, their addresses may remain "reserved" in the router's memory.
In this case, when you try to connect your phone, the router physically cannot assign it a unique IP address, and the connection hangs during the identification phase. The computer connected via cable may have received its address earlier, when the pool was not yet exhausted, or it may have been assigned a static IP, so it works without problems. To resolve this issue, clear the list of leased addresses.
How does DHCP work and why is it important?
DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses, subnet masks, and gateways to devices on the network. Without this process, each device would have to be configured manually. When the address pool is exhausted, new devices are left behind, even if the physical Wi-Fi signal is excellent.
To fix this, log into the router's web interface using a browser on your computer. You'll need to find the section related to LAN settings or the DHCP status. There's often a "Clear List" or "Delete All" button. If there's no such option, a full router reboot will clear all temporary address leases.
It's also worth checking whether the address range is set too small. If the default is only 10 addresses, and you have a lot of smart devices in your home, this won't be enough. Expand the range in the settings. DHCP Serverto cover more possible connections.
Problems with the 2.4 GHz and 5 GHz frequency ranges
Modern routers often operate in two ranges: 2.4 GHz And 5 GHzOlder or budget smartphones may only support the 2.4 GHz frequency, while a new laptop can connect to a 5 GHz network. If the 2.4 GHz wireless module is disabled, blocked, or malfunctioning in the router settings, the phone simply won't see the network, although the computer will work via 5 GHz or a cable.
Users often accidentally disable one of the bands in an attempt to "optimize" the network, forgetting that many IoT devices (lamps, vacuum cleaners) and older phones cannot operate on the high 5 GHz frequencies due to their shorter range and lesser penetration. Check if the mode is activated. dual-band or a separate network for 2.4 GHz.
Another issue is the "smart" frequency switching (Smart Connect), when the router itself decides where to connect the device. The algorithm may malfunction, attempting to connect the phone to the 5 GHz band, where the signal is weak, instead of switching to the stable 2.4 GHz. In this case, it is recommended to change the settings. Wireless Settings separate networks by giving them different names (SSIDs), for example, MyWiFi And MyWiFi_5G, and force the phone to connect to the desired one.
It's also worth paying attention to broadcast channels. If neighboring routers have clogged all available channels in the 2.4 GHz band, your phone may be unable to penetrate the noise, while your computer's cable connection remains unaffected. Use Wi-Fi analyzer apps on your phone to find a free channel, and manually enter it in the router settings, selecting the value 1, 6 or 11.
MAC filtering and device blocking
MAC filtering is a powerful security feature that often causes problems. MAC address — This is the unique identifier of the device's network card. If the "White List" mode is enabled in the router settings, only devices whose addresses are added to the database can connect. Your computer may be on this list, but the new phone is not, so it will be rejected.
Conversely, if the "Deny List" is enabled, the phone may be blocked accidentally or intentionally (for example, by parental controls or guest access restrictions). In this case, the router will see the connection request but ignore it or return an authorization error.
To check, log into the router control panel and find the section Wireless MAC Filtering or "MAC Address Filtering." Check if this feature is enabled. If so, check the lists of allowed and blocked devices. If you don't remember your router password, someone else may have configured the filtering, and you'll need to reset the settings.
It's important to note that modern smartphones (iOS and Android) use a feature called "Private Wi-Fi Address" or "MAC Address Randomization" to protect your privacy. This means that your phone may present a new, random MAC address to the router each time it connects. If you have strict filtering enabled, the router will block your phone because its "new" address doesn't match the "old" one stored in its memory.
⚠️ Attention: If you use MAC address randomization on your phone, please add the device to the router's whitelist again after the phone connects, or disable this feature for your home network in the Wi-Fi settings on the smartphone itself.
Limiting the number of connected clients
Many routers, especially carrier-grade models or entry-level devices, have an artificial or technical limit on the number of simultaneously connected clients. Even if IP addresses are still available in the DHCP pool, the router's processor may be unable to handle processing routing tables for a large number of devices. In such cases, the rule of "first come, first served" often applies.
Your computer, being constantly connected, takes its rightful place in the queue. When you try to add a phone, the router simply rejects the request, as the limit of, say, 10 or 15 devices has already been reached. This often happens in apartment buildings, where numerous devices attempt to connect to a single access point.
☑️ Check connection limits
You can check and change this setting in the wireless settings. Look for the field Max Clients, Limit Users or "Maximum number of users." Make sure it's not set to "1" or too low. It's best to set it with a marginal value, such as 20-30, even if you have fewer devices to avoid problems when guests arrive.
It's also worth considering the router's processor load. If you have many connected smart devices that constantly send data (cameras, sensors), the router may programmatically limit new connections to maintain the stability of existing ones. In this case, the only solution is to upgrade to a more powerful model.
Incorrect security and encryption settings
Connection issues often arise due to incompatible encryption protocols. If your router uses a modern standard, WPA3, and your phone only supports WPA2, the connection will fail. The computer with the new network card may work, but the phone will not. This is a classic example of a conflict of security standards.
It is recommended to use mixed mode WPA/WPA2-Personal (AES), which provides the best compatibility with all device types. Avoid using TKIP or pure WEP, as they are not only outdated but can also block connections from modern smartphones, which consider such networks insecure.
Why might WPA3 block older devices?
The WPA3 protocol requires support for certain cryptographic functions that are not available in Wi-Fi chips manufactured between 2018 and 2019. When attempting to connect to a WPA3-only network, an older phone will simply not see the network or will return a password error.
Another issue is the length and characters in your password. Some older phones may not correctly process passwords containing special characters or exceeding a certain length (although the standard allows up to 63 characters). Try temporarily changing your password to a simpler one consisting only of numbers and Latin letters to rule out this issue.
Also, check if the SSID hiding feature (hidden network) is enabled. If your computer is manually connected to a hidden network (using a profile), it will work. However, your phone, when scanning the air, won't see the network and won't offer to connect until you manually enter the network name and security type.
Router overheating and software failures
Don't forget about the hardware side of the problem. A router is a small computer that gets hot. If it's in a closed niche, exposed to direct sunlight, or piled high with papers, its Wi-Fi module may throttle (reduce performance) or shut down completely due to overheating, while the wired port remains active. This is a common reason why internet connection drops on wireless devices.
Software glitches (firmware bugs) can also cause the process responsible for the radio module to freeze. This may not show up as a critical error in the router logs, and to the user, it appears as if magic happened: the cable works, but the Wi-Fi is dead.
⚠️ Attention: Interfaces and menu names may vary depending on the router model (TP-Link, Asus, Keenetic, Xiaomi). Always consult the official documentation from your device manufacturer, as the location of settings may change with firmware updates.
To diagnose the problem, touch the router's casing. If it's hot, ensure it's cooled. Try temporarily removing the cover (if your warranty allows) or placing a fan nearby. If your phone can connect to the network after this, the problem is overheating.
The second step is updating the firmware. Go to the manufacturer's website, download the latest firmware version for your model, and update the router via the web interface. Manufacturers often release patches that specifically address Wi-Fi module stability issues.
Diagnostic Chart: Computer vs. Phone
To help you organize your problems, we've compiled a table that will help you quickly determine the direction of troubleshooting by comparing the behavior of different devices.
| Symptom | Probable cause | Where to look for a solution |
|---|---|---|
| The PC is working, but the phone says "Incorrect password" | Error in the saved profile on the phone or change of encryption type | Wi-Fi settings on your phone (Forget network) |
| PC is working, phone is "Obtaining IP..." | DHCP conflict or address pool overflow | LAN/DHCP Server settings on the router |
| The PC is working, but the phone doesn't see the network. | Hidden SSID or frequency incompatibility (2.4 vs. 5 GHz) | Wireless Settings / Hidden Networks |
| The PC works, the phone sees it, but it doesn't connect. | MAC filtering or client limit | Security / MAC Filtering section |
Use this table as a checklist for initial diagnostics. It covers 90% of all issues encountered by home network users.
FAQ: Frequently Asked Questions
Why does resetting the router help, but the problem returns a day later?
This is a sure sign of insufficient RAM or a firmware memory leak. When the memory fills with junk, new connections are blocked. A reset clears the memory. Solution: update the firmware or replace the router with a more powerful one.
Can an antivirus on a computer block Wi-Fi on a phone?
Directly, no; antivirus software on a PC doesn't control radio waves. However, if the PC has software for creating virtual access points or managing the network (for example, from an operator), it may conflict with the router settings, causing DHCP failures.
What should I do if my phone connects but says "No Internet access"?
Check the date and time settings on your phone. If they're incorrect, security certificates won't work, and websites won't load. Also, check if your phone has a static IP address that conflicts with your network.
Does distance affect whether the PC works but the phone doesn't?
Yes. The antennas in laptops and PCs are often more powerful and have better gain than those in compact smartphones. If the phone is at the edge of its coverage area, it may see the network but not have a sufficient signal strength for the handshake connection.
⚠️ Attention: If none of these methods help, the router's Wi-Fi module itself may be faulty. The wired port and the wireless module are different physical components. Repairing the Wi-Fi module is often uneconomical; it's easier to buy a new router.