It's understandably frustrating when one smartphone flatly refuses to recognize a hotspot created on another device. It would seem that both models are running the same network. AndroidBluetooth is enabled, mobile data is active, but the desired signal is simply not in the list of available networks. This isn't magic or a hardware malfunction, but most often the result of conflicting software settings or radio module features.
Modern operating systems strive to provide maximum user security by implementing complex protection algorithms that sometimes work against convenience. Device owners often encounter the following: modem mode It's active, but nearby devices are ignoring it. Understanding the reasons for this behavior allows you to resolve the issue in a couple of minutes, without having to perform a full reset.
In this article, we'll delve into the technical nuances behind the simple absence of a Wi-Fi icon. We'll cover frequency bands, security policies, and hidden system limitations. Google constantly updates communication protocols, so old connection methods may no longer work on new firmware versions.
Frequency Conflict: 2.4 GHz vs. 5 GHz
One of the most common reasons why a phone can't detect Wi-Fi from another phone is incompatibility of frequency bands. Older or budget smartphone models are often equipped with modules that operate exclusively in the frequency band. 2.4 GHzAt the same time, modern flagships by default create an access point in a faster and less congested range 5 GHz.
If your receiving phone doesn't physically support 5GHz, it will simply filter the signal, even if it sees its name in the scanner. The internet access point may be configured to automatically select a band, which, given current radio conditions, will select 5GHz. This creates a situation where devices are centimeters apart but can't "hear" each other.
⚠️ Note: On some models Samsung And Xiaomi Switching the range is only possible after resetting the network settings, since the system caches the previous successful protocol.
To fix this, you need to manually change the access point settings on the router. Interfaces may differ, but the logic is the same: force the modem to switch to 2.4 GHz mode. This will ensure maximum compatibility with all surrounding devices, including older laptops and tablets.
It's also worth considering that the 5 GHz band has less penetration through walls, but in this case, we're talking about a direct connection. However, if there are metal objects or sources of strong interference between the phones, the 5 GHz signal may be unstable, which will also cause the network to disappear from the available list.
Hidden hotspot settings and security type
Another critical factor is the type of security protocol. If the distributing device has an encryption standard installed, WPA3, and the receiving phone only supports WPA2, the connection will not be established. The operating system may not even show the network in the list, deeming it incompatible or unsafe for the current configuration.
Users often accidentally activate the "Hidden Network" feature. In this mode, the access point does not broadcast its SSID (Network name). To connect, you must manually enter the network name, character by character, including capitalization. If you forget to enable this option, the client phone will simply scan the airwaves and fail to find your signal.
- 📡 Check if the "Hide device" box is checked in the modem settings.
- 🔒 Make sure the security type is set to WPA2-Personal for maximum compatibility.
- 📝 Make sure that the network name (SSID) does not contain special characters that may not display correctly on another device.
It's also worth paying attention to the maximum number of connected users. If the limit is reached (usually 5-10 devices), the new phone won't be able to see the connection option or will be rejected immediately upon attempting to connect. In the hotspot settings Android This option is often hidden in an additional menu.
Problems with MAC addressing and randomization
Starting from Android 10The system has implemented a MAC address randomization feature to enhance privacy. This means that each time the phone connects to a new network, it may use a temporary, random address instead of the actual physical one. Some older access points or specific router settings on other phones may block these "floating" addresses.
If the sending phone is configured for MAC address filtering (whitelisting), and the connecting phone constantly changes its identifier, access will be denied. This is common in corporate networks or when using third-party hotspot apps. The solution lies in the Wi-Fi settings of the specific profile.
To disable randomization for a specific network, you need to:
- Find the network in the list of saved ones (or try to connect and wait for an error).
- Click on the settings gear next to the network name.
- In the "Privacy" section, select "Use device MAC address" instead of "Random MAC address".
This measure often helps when the phone sees the network, but is stuck indefinitely in the "Obtaining IP address" or "Authentication" status. Physical address The device must be static for trusted access points to avoid driver-level conflicts.
Software crashes and network service cache
operating system Android The system is complex, and sometimes network services simply freeze. The Wi-Fi module may not process scanning requests correctly, especially if the phone hasn't rebooted in a long time. Background processes may be blocking new connections or monopolizing the radio.
Resetting network settings is a drastic, but often the only effective method. It doesn't delete your photos or contacts, but it does erase all saved Wi-Fi passwords, Bluetooth settings, and mobile hotspots. This returns the network stack to its factory defaults, eliminating accumulated configuration errors.
To perform a reset, go to Settings → System → Reset settings → Reset Wi-Fi, mobile data, and Bluetooth settingsAfter this procedure, the phone will reboot, and you will have to re-enter your home network passwords, but the problem with hotspot visibility often disappears.
☑️ Diagnostics before reset
Impact of energy saving and third-party optimizers
Aggressive power-saving settings are the bane of modern smartphones. To extend battery life, the system can limit background Wi-Fi activity or completely disable the module if the screen is off. If the sending phone goes to sleep, it stops broadcasting the signal, and the client phone loses sight of it.
Chinese casing manufacturers (MIUI, ColorOS, Funtouch OS) are known for their particularly strict optimization. They can "kill" the internet sharing process, considering it energy-consuming. You should add the "Access Point" app or the system sharing process to the battery exceptions.
| Action | Menu path (approximate) | Target |
|---|---|---|
| Disabling savings | Battery → Energy Saving |
Allow background work |
| Blocking applications | Security → Permissions |
Prevent process from closing |
| Modem mode | Access Point → Timeout |
Disable auto-shutdown |
| Memory optimization | Settings → Memory |
Do not clean up system services |
Also, check if your hotspot has a timeout. By default, many phones turn off the modem after 10 minutes of inactivity. If you're just waiting for a connection and the hotspot's screen goes blank, the timeout may have caused the connection to disappear.
Hardware limitations and drivers
Physical damage also cannot be ruled out. The Wi-Fi antenna in smartphones is often combined with the Bluetooth and NFC modules. If, after a fall or exposure to water, only Wi-Fi is lost, but Bluetooth remains active (or vice versa), this may indicate a loose antenna cable or a faulty chip.
In rare cases, the problem lies in the drivers after a system update. If you updated Android and immediately after that, the network connection stopped working. It's possible the new firmware version contains a bug. In such cases, waiting for a patch from the manufacturer or, for advanced users, rolling back to the previous software version can help.
⚠️ Caution: If the phone heats up around the camera or top edge when Wi-Fi is enabled, this may indicate a short circuit in the antenna module. Turn off the device immediately.
You can perform hardware diagnostics using the engineering menu. By entering the code ##4636## In the dialer (not available on all models), you can access the testing menu. There, you can view the Wi-Fi status, run a signal test, and see if the module can see any networks at all.
Engineering code not working?
Some shells (such as MIUI or OneUI) block access to the test menu. Try installing the "Phone Info SAM" or "AIDA64" apps to view module status.
FAQ: Frequently Asked Questions
Why does the laptop see the access point, but the other phone does not?
The issue is most likely a frequency band issue. Laptops often have more advanced modules that support both bands (2.4 and 5 GHz), while the second phone may be limited to 2.4 GHz. Try switching your access point to 2.4 GHz mode.
Can I share Wi-Fi if I don't have a SIM card?
Yes, you can. Your phone can broadcast a Wi-Fi signal using an existing Wi-Fi connection (repeater mode), if supported by the model and Android version. However, traditional mobile data tethering requires an active SIM card with a data plan.
My phone says "Unable to obtain IP address." What should I do?
This indicates an address conflict or a DHCP server error on the sending device. Try changing the IP settings on the receiving phone from "DHCP" to "Static" in the Wi-Fi network settings and manually entering the address, for example, 192.168.43.50.
Does battery charge affect network visibility?
Yes, when the battery level is critically low (usually below 10-15%), the system can automatically turn off the access point or limit the signal strength to save energy, which makes the network invisible to other devices.