It's quite common for one smartphone to be unable to connect to another's access point, and it's perplexing, given that Wi-Fi Direct and regular internet tethering seem like simple functions. The user activates tethering on the source device, but the receiving device either doesn't see the network at all or endlessly tries to obtain an IP address without successfully connecting. This can be due to frequency band conflicts, carrier restrictions, or simple software glitches in the operating system.
In most cases, the problem stems from incompatible safety standards or airwave congestion, which is especially true in apartment buildings. WPA3 protocol, implemented in new models, may block connections from older devices that only support WPA2. It's also worth considering that modern smartphones often use the 5 GHz band by default for wireless LAN, while budget models or older devices may not physically have a module capable of operating on this frequency.
Below, we'll take a detailed look at the technical aspects that can interfere with establishing a stable connection between two mobile devices. You'll learn how to properly configure hotspot settings, where to look for hidden provider restrictions, and which system files can block data transfer. Understanding these nuances will allow you to quickly restore internet access without having to reboot your devices dozens of times.
Conflicts between Wi-Fi frequency bands and standards
One of the most common reasons for connection failure is a mismatch in operating frequencies. Modern flagship smartphones often automatically select a frequency range when creating a hotspot. 5 GHz, as it provides higher speeds and is less susceptible to interference. However, many mid-range and budget devices, as well as all wearable electronics like smartwatches, are equipped with modules that operate exclusively on the frequency 2.4 GHz.
If your client phone can't see the network created by another phone, there's a 90% chance it's simply not hearing the signal due to hardware limitations. In the access point settings on the source device (usually in the Settings → Connections → Mobile hotspot → Setup) you need to force a band change. Selecting "All" or specifically "2.4 GHz" will make the network visible to a wide range of devices.
Channel width also plays a role. If the transmitting device is set to 40 or 80 MHz, and the receiving device expects 20 MHz, a stable connection will not be achieved. Channel width This is a critical parameter often ignored by users, but it is responsible for throughput and compatibility. In dense urban environments, it is better to use automatic selection or a fixed 20 MHz value for maximum compatibility.
It's also worth mentioning Wi-Fi standards. If one phone only supports the older protocol, 802.11n, and the second one is trying to impose a newer one 802.11ac (Wi-Fi 5) or 802.11ax (Wi-Fi 6) without compatibility mode, the handshake may fail. In such cases, resetting the network settings on both devices helps, forcing them to renegotiate the connection parameters.
SIM card issues and operator restrictions
Often, technically functional phones can't share internet with each other due to blocking by their mobile carrier. Many providers' plans contain hidden or explicit restrictions on data sharing. In this case, the source phone creates a network, other devices connect to it, but the internet doesn't work, or the connection is blocked before it even obtains an IP address.
Operators determine whether internet is being shared using several methods. The simplest is parameter analysis. TTL (Time To Live)The request from the computer or second phone has a different TTL than the request from the smartphone itself (usually 64 versus 128 or 63 versus 64). The carrier detects the difference and blocks the connection or starts charging additional fees. Some providers also analyze the User-Agent of requests, checking whether the traffic is used to update desktop applications.
⚠️ Please note: Internet tethering pricing terms are subject to change by the operator unilaterally. Before setting up a hotspot, be sure to check the current terms of your plan in your personal account or the provider's mobile app to avoid unexpected charges.
To circumvent these limitations, users often resort to changing the TTL at the operating system level, but on modern versions of Android and iOS this requires superuser rights (Root) or using special APN configurations. Without in-depth technical knowledge, tampering with system files is dangerous, as it can lead to unstable operation of the communication module.
The SIM card type itself may also be the issue. If the card is very old and doesn't support 4G/LTE technology, the upload speed will be extremely slow, which may be perceived as a disconnected connection. Furthermore, if the primary number's high-speed data plan runs out, the operator may limit the speed to 64 kbps, effectively making it impossible to use the Wi-Fi network for loading pages.
Access point settings and security type
Correctness of the entered security parameters is another key factor. When creating an access point, the source phone encrypts the traffic, and the receiving device must use the same encryption algorithm. The most common standards are WPA2-Personal and newer WPA3-PersonalIf one device has WPA3 installed and the other does not support it (which is typical for devices older than 2018), connection will be impossible.
It is recommended to manually set the protection type to WPA2 PSK in the access point settings. This is the most universal standard, understood by virtually all wireless devices. It's also worth paying attention to the password complexity: using special characters or mixed-case letters can sometimes cause parsing errors on the client side, especially if the devices' operating systems are very different (for example, iOS and older Android).
☑️ Checking access point settings
The maximum number of connected users is also an important parameter. Access points often have a limit of 5 or 10 devices in their settings. If this limit is reached, a new phone simply won't be able to connect to the network, even if the password is entered correctly. Reset your access point to factory settings to remove all user restrictions and limitations.
Hiding the SSID deserves special attention. If the "Hide My Device" or "Hidden Network" feature is enabled on the broadcasting device, the client phone won't see it in the list of available networks. You'll have to manually enter the network name (SSID) exactly, taking care to ensure proper capitalization, which often leads to typos.
Software glitches and network settings cache
Smartphone operating systems accumulate a huge amount of temporary data about the networks they have ever connected to. network cache may contain conflicting entries, especially if you've previously connected to a network with the same name (SSID) but different security settings. This causes the phone to attempt to apply the old settings to the new network, resulting in a connection loop.
To resolve this issue, you need to reset your network settings. On Android, this can be done through the menu. Settings → System → Reset settings → Reset Wi-Fi, mobile data, and Bluetooth settingsOn iOS, the path looks like this: Settings → General → Transfer or reset iPhone → Reset → Reset Network SettingsThis operation will delete all saved passwords for Wi-Fi and Bluetooth devices, but is often the only way to fix a software glitch.
Another possible cause could be background processes or heavy system updates. If the source phone is actively downloading an OS update or syncing photos to the cloud while sharing, the processor and radio module may be unable to handle the load, dropping new connections. Also, antivirus programs or firewalls installed by the user may block incoming connections, deeming them suspicious.
Why is resetting network settings safe?
Resetting network settings doesn't delete your personal data: photos, contacts, apps, and messages remain intact. Only connection configurations are deleted: Wi-Fi passwords, Bluetooth settings, and cellular network (APN) settings. This is a standard system maintenance procedure.
Impact of power saving and flight modes
Modern smartphones aggressively optimize power consumption. Power-saving mode can forcibly disable Wi-Fi or reduce its signal strength if the battery charge drops below a certain level (usually 15-20%). In this state, the phone may stop detecting networks or be unable to maintain a stable connection as a hotspot.
Additionally, there's a peculiarity with radio modules: simultaneously operating GPS, Bluetooth, and Wi-Fi at full power can cause interference within the device. If the source phone has GPS enabled, it can jam the Wi-Fi signal. Try disabling geolocation and Bluetooth on both devices while troubleshooting.
Sometimes simply switching to airplane mode helps. Turning on the mode Flight Mode For 10-15 seconds, the radio module is completely de-energized, resetting its state. After disabling airplane mode, the module is reinitialized, registers with the operator's network, and often begins functioning correctly. This is faster and more effective than a full reboot of the smartphone.
Temperature conditions should also be taken into account. If the phone overheats (for example, if it's left in direct sunlight or under load in a case), the system may programmatically limit the Wi-Fi transmitter power to protect components. As a result, the network range is reduced to a few centimeters, making it impossible to connect.
Comparison table of causes and solutions
To quickly diagnose the problem, use the table below, which summarizes the most likely failure scenarios and troubleshooting methods. This will help structure your troubleshooting.
| Symptom | Probable cause | Solution method |
|---|---|---|
| The network is not displayed in the list. | Different frequency ranges (5 GHz vs. 2.4 GHz) | Switch the access point to 2.4 GHz |
| Infinite IP acquisition | IP address or DHCP conflict | Forget the network and reset network settings |
| Connected, but no internet | Time-to-Live (TTL) | Check your tariff or change your APN |
| Authentication error | Incorrect password or encryption type | Change the password, select WPA2 |
| The connection keeps dropping out | Energy saving or overheating | Turn off power saving, remove the cover |
Frequently Asked Questions (FAQ)
Why doesn't my iPhone see my Android smartphone's hotspot?
The most common issue is with the 5 GHz frequency. iPhones, especially older models, may not detect 5 GHz networks if they're configured for specific channels. Conversely, newer iPhones require WPA3, which Android distributes in mixed mode. Try switching Android to compatibility mode (2.4 GHz) and changing the security type to WPA2.
Is it possible to share Wi-Fi if there is no SIM card on the phone?
No, to share mobile internet via a Wi-Fi hotspot, the source phone must have an active SIM card with a working mobile internet connection. Without a SIM card, the phone can only function as a Wi-Fi repeater (if connected to another network), but not as a modem.
How many devices can be connected to the phone at the same time?
Modern smartphones typically support 5 to 10 simultaneous connections. However, the actual number depends on the processor and operating system. When connecting to a large number of devices, the internet speed on each device will drop significantly, and the phone may begin to overheat.
Does Wi-Fi sharing affect the speed of mobile internet on the phone itself?
Yes, it does. The connection bandwidth is shared between all connected devices. If someone connects to your hotspot and starts downloading a large file, your own browsing speed will also drop. Furthermore, active data sharing drains your battery significantly faster.
What should I do if the 4G icon is on, but Wi-Fi internet isn't working?
This is a classic sign of a carrier block or incorrect APN settings. Check if the internet is available in the browser on the source phone itself. If everything works there, try changing the access point name (APN) to something else (e.g., internet) in the mobile network settings.