If the second Android smartphone does not see the access point of the first, although the devices are nearby, the reason most often lies in the incompatibility of frequency bands (2.4 GHz versus 5 GHz) or an active power saving mode that hides the network from search.
The technology Wi-Fi Direct and modem mode is based on a complex data exchange protocol, which can fail at the slightest mismatch of parameters. For example, if the transmitter operates in the 5 GHz band, but the receiving device has an outdated module that only supports 2.4 GHz, the connection is physically impossible. It is also worth considering that modern Android shells (MIUI, OneUI, ColorOS) can block network visibility in the background to save battery power.
To diagnose the problem, you need to sequentially check the settings of both devices, starting with basic visibility settings and ending with resetting network configurations. In this article, we will analyze in detail the technical nuances that interfere with the correct operation of the “Access Point” function, and we will propose specific action algorithms for restoring communication without contacting a service center.
Incompatibility of frequency ranges and Wi-Fi standards
One of the most common reasons for network invisibility is operation in different frequency ranges. Modern smartphones often activate an access point in the range by default 5 GHz, as it provides higher data transfer speeds and is less loaded by neighboring networks. However, many budget models or devices of previous generations are equipped with modules that exclusively support the standard 802.11n in the 2.4 GHz band.
If your client phone simply does not “see” the network, most likely, it physically cannot receive a signal at the frequency that the distributor is broadcasting. In the access point settings on the source device, you must explicitly specify the preferred range. Typically, this option is hidden in additional settings, available after clicking on the gear or the “More” button in the modem menu.
⚠️ Attention: Forced switching to the 2.4 GHz band may reduce the maximum Internet speed, but guarantees compatibility with older devices and better signal penetration through walls.
Also worth paying attention to to safety standards. If one device has an encryption protocol installed, and the other device does not support it (which is typical for phones older than 2018-2019), the network may be displayed, but connection will not be possible, or the network will be completely hidden for incompatible clients. It is recommended to temporarily set the protection type WPA3, and another device does not support it (which is typical for phones older than 2018-2019), the network may be displayed, but connection will be impossible, or the network will be completely hidden for incompatible clients. It is recommended to temporarily set the protection type WPA2 PSK to test the hypothesis.
For maximum compatibility, set the frequency range to “2.4 GHz” and the encryption type to “WPA2-Personal” in the access point settings. This is a universal configuration that almost all Wi-Fi modules understand.
Problems with SSID visibility and hidden networks
Sometimes users accidentally activate the network name hiding function (SSID), believing that this will increase security. In fact, with the Hide Device or Hide Access Point option enabled, your phone will not broadcast the network name over the air. Other gadgets will not be able to detect it during normal scanning, and to connect you will need to manually enter the network name and password.
Check the access point settings on the distribution phone. Look for a switch named "Device Visibility", "Broadcast Network Name" or similar. It must be in the active position. If this function is disabled, the network exists, but it is invisible to passive scanning, which is often perceived as a failure of the Wi-Fi module.
- 📡 Check if the “Hide my access point” checkbox is enabled in the modem settings.
- 📝 Make sure that the network name (SSID) does not contain special characters that may be displayed incorrectly on the receiving device device.
- 🔄 Try changing the network name to a simple Latin word without spaces to eliminate encoding errors.
In addition, some custom firmware has the “Invisibility Mode” function to save energy when the access point turns on only when you try to connect a known device. Disable any Wi-Fi smart power management features that may limit network visibility.
The impact of power saving and background restrictions
Modern versions of Android manage energy consumption extremely aggressively. The system can forcefully turn off the Wi-Fi module or limit the operation of the access point if the screen of the distribution device is turned off or if the system considers that the tethering application is consuming too many resources. This leads to the fact that the network disappears from the list of available ones a few minutes after turning it on.
It is necessary to exclude the “Access Point” application or the modem system service from battery optimization. Go to the battery settings, find the list of applications and make sure that the system communication services are not set to the “Power Saver” or “Deep Sleep” restriction. For stable operation, it is better to select the “No restrictions” mode.
| Restriction level | Impact on the access point | Recommendation |
|---|---|---|
| Unlimited | Stable operation in the background | Ideal for distribution |
| Optimized | Possible breaks when the screen is off | Acceptable for short-term use |
| Strict saving | Instant shutdown in the background | Disable for modem |
Also check if the “Ultra-energy saving” mode is activated on the receiving phone itself. In this mode, network scanning may occur less frequently, and background processes responsible for connections may be blocked. Temporarily disabling this mode often solves the problem of instant network discovery.
Aggressive energy saving is the main enemy of a stable access point. Always remove the modem system service from the list of optimized applications.
APN and mobile data configuration errors
Even if the Wi-Fi modules are working properly, the access point will not work correctly if the mobile operator's access point is not configured correctly on the distributing device (APN). The phone may broadcast a signal, but not transmit data, or may not activate the modem at all due to the lack of a valid Internet profile.
Go to the mobile network settings and check the access point (APN) settings. Make sure you select the correct profile for your carrier. Sometimes resetting APN settings to factory values solves the problem, since the configuration may have included outdated or incorrect data obtained during automatic configuration.
Settings → Mobile network → Access points (APN) → Menu (three dots) → Reset to default settingsIf you are using a dual-SIM phone, make sure that The SIM card on which the Internet tariff is active is selected for data transfer. Switching the Internet between slots may require a reboot of the communication module, during which the access point may temporarily become invisible.
⚠️ Attention: Changing APN parameters manually without accurate data from the operator can lead to a complete loss of mobile data. If you are not sure of the field values, use the reset function.
IP address conflicts and DHCP settings
In rare cases, the problem lies in an IP address conflict within the created subnet. When the phone creates an access point, it acts as DHCP serverdistributing addresses to connected clients. If the address range is configured incorrectly or if the client tries to use a static IP that conflicts with the gateway, the connection will not succeed.
Try changing the IP addressing settings in the access point menu. If possible, switch the mode from “Static” to “DHCP” or vice versa to test the network response. It's also worth checking to see if the receiving phone has a static IP address set in its Wi-Fi settings for that particular network.
- 🌐 Make sure the client's Wi-Fi settings are set to "DHCP" rather than "Static."
- 🔢 Check to see if the gateway's IP address is the same as another device on the network.
- 🔄 Rebooting both devices will often clear the DHCP lease cache and resolve the issue.
Resetting the network settings on both devices is a drastic but effective method. This operation will delete all saved Wi-Fi passwords, Bluetooth settings, and mobile hotspots, returning the network stack to its factory state. This eliminates any software layers that interfere with the correct operation of the protocols.
☑️ Diagnosis of network conflicts
Hardware limitations and Wi-Fi module drivers
Hardware factors cannot be ruled out. Wi-Fi module drivers in the Android kernel may not work correctly after an unsuccessful system update or installation of custom firmware. In some cases, the module “freezes” in a certain state and stops correctly scanning the airwaves or switching to access point mode.
If the problem appeared after a software update, the new firmware version may contain errors in the wireless drivers. In this case, it is worth checking the developer forums for your phone model for known bugs. Sometimes clearing the partition cache Dalvik/ART Cache via Recovery mode helps, but this requires certain skills.
⚠️ Attention: If the problem is observed only on one specific phone model when connected to any other networks, there is a high probability of a defect in the antenna module or its cable.
It is also worth considering the physical location of the devices. Metal cases, thick protective glass, or simply an unfortunate position of the phones relative to each other (for example, the antennas are covered by the palms) can weaken the signal to a level where it is not detected by the scanner, although formally the distribution is ongoing.
Hidden developer function
In the “For Developers” menu there is an option “Always turn on mobile Wi-Fi.” Enabling it can speed up switching between networks, but increases battery consumption.
Frequently asked questions (FAQ)
Why does the phone see other Wi-Fi networks, but does not see the access point from a friend?
This indicates incompatibility of standards. Most likely, the access point operates at 5 GHz or uses the WPA3 encryption protocol, which your phone does not support. Try changing the distributor settings to 2.4 GHz and WPA2.
Can a virus block the visibility of an access point?
Theoretically, yes, malware can change network settings or block system services. However, more often the reason is system failures or energy saving settings. Check your phone with an antivirus and reset the network settings.
What to do if the network is visible, but it says “Authentication error”?
Check that the password is entered correctly. Pay attention to letter case and keyboard layout. If the password is correct, try deleting the network on the receiving device and forgetting it, then connect again.
Does the number of connected devices affect the visibility of the network?
Yes, some phones have a limit on the number of connected clients (usually 5-10). When the limit is reached, new devices may not see the network or may not be able to connect. Disconnect unnecessary devices and check again.
Will resetting to factory settings help?
This is an extreme measure. If the problem is software and cannot be solved by resetting the network settings, a full reset (Factory Reset) will delete all data, but is guaranteed to return the original driver and system settings, eliminating software conflicts.