The modern smartphone has long ceased to be just a device for making calls, turning into a full-fledged control center for digital life and communications. Model Samsung Galaxy A31Despite its age, it remains popular thanks to its balanced features and functionality. One of the most popular features is the modem mode, which allows you to instantly connect your laptop, tablet, or other device to the internet anywhere in the world.
The process of activating router mode in the operating system Android with shell One UI Samsung's Wi-Fi is designed to be as user-friendly as possible. You don't need advanced technical knowledge or third-party apps, as all the necessary tools are already built into the system. Properly setting security and signal frequency parameters will ensure a stable connection that won't drop at the most inopportune moment.
In this article, we'll cover every setup step in detail, from basic setup to fine-tuning settings for maximum speed. You'll learn how to protect your network from unauthorized connections and what to do if other devices can't see your hotspot. Following these instructions will turn your smartphone into a reliable internet source.
Preparing the device to operate in router mode
Before setting up the radio, you need to make sure your device is ready to act as a signal source. The battery level is critical, as it requires active data transfer and radio operation. Wi-Fi significantly increase power consumption. If the battery charge drops below a critical level, the phone may automatically disable the hotspot or power off, interrupting the connection.
It's also worth checking your SIM card status and whether you have mobile data. Make sure data is enabled in your mobile network settings, as otherwise, the internet on connected devices won't work. In some cases, carriers block data sharing on unlimited internet plans, so it's a good idea to check the terms of your plan.
Pay attention to your smartphone's temperature. When used in modem mode for extended periods, the device's casing may heat up. This is a normal physical process, but requires monitoring. If the phone overheats, the system will automatically limit performance or disable communication modules to protect internal components.
⚠️ Attention: Extended use in hotspot mode while charging from a weak power supply can cause the battery to overheat and swell. Use the original charger or a powerful power bank.
Basic hotspot activation on the Samsung A31
You can launch tethering mode on Samsung smartphones through the quick settings menu or the main system settings menu. The fastest way is to swipe down from the top of the screen to open the notification panel. Among the icons, you'll need to find the item Mobile hotspot or Wi-Fi hotspot and tap it to activate the feature. If the icon isn't on the first page, swipe left to reveal the full list of available toggles.
More detailed control over network parameters is available through the settings menu. To do this, open Settings, then go to the section Connections. Here you are interested in the point Mobile hotspot and modemThis section contains all the switches for various internet sharing methods, including USB modem and Bluetooth modem, but we're specifically interested in wireless networking.
☑️ Check before switching on
Once the feature is enabled, the phone will start broadcasting a signal, the default network name usually contains the device model, for example, Galaxy A31To connect to another device, find this network in the list of available Wi-Fi networks and enter the password. The default password is often listed under the network name in your phone's settings, but it is highly recommended to change it to a more complex and unique one.
Setting up a network name and security password
The security of your personal network is your number one priority, as all your data is transmitted through it. By going to the menu Mobile hotspot, click on the network name or button Setting upto change the parameters. Field SSID (network name) can be renamed to anything you want to easily identify your access point in the list of neighboring networks.
Pay special attention to the password field. Android requires a password of at least 8 characters. It's recommended to use a combination of upper- and lower-case letters, numbers, and special characters. This will protect you from automated password guessing attempts by hackers within range.
You can also select an encryption protocol in the security settings. For the Samsung A31, the current standard is WPA2 PSK, which provides a high level of data security. Older protocols, such as WEP, are not supported or recommended due to vulnerabilities, and the latest WPA3 may not be available on some firmware versions or supported by older clients.
Keep in mind that when you change your password, all previously connected devices will lose connection and require new login information. This is a convenient way to instantly disconnect all users if you suspect unauthorized users are using your internet connection.
Choosing a Frequency Band: 2.4 GHz vs. 5 GHz
One of the important settings that affects connection speed and stability is the frequency band selection. In the hotspot settings menu on the Samsung A31, you can find the option AP rangeHere, the user is offered a choice between 2.4 GHz and 5 GHz frequencies. Understanding the differences between them will help you optimize your network for specific tasks.
The 2.4 GHz band is more versatile and compatible. It provides greater signal coverage and penetrates walls and obstacles better. However, this band is often congested, as most household appliances and neighbors' routers operate on it, which can lead to interference and reduced speeds.
The 5 GHz band offers significantly higher data transfer rates and is less susceptible to interference. It's ideal for watching high-definition video or online gaming. However, its range is shorter and the signal has poorer penetration through solid walls. Furthermore, older devices may simply not see the network in this range.
| Parameter | 2.4 GHz | 5 GHz |
|---|---|---|
| Transfer speed | Average | High |
| Range | Big | Medium/Small |
| Penetration ability | High | Low |
| Compatibility | Almost 100% | Needs support |
Managing connected devices
Shell functionality One UI Allows you to not only create a network but also effectively manage those connected to it. The access point's main menu displays a list of active devices with their names and MAC addresses. This allows you to monitor who is currently using your internet.
If you spot an unknown device in the list, you can instantly block it. To do this, simply click on the device name and select the option Disable or add it to the blacklist. This action will terminate the connection for the selected device, making it impossible to reconnect without your permission.
You can also limit the maximum number of connected devices in the settings. By default, this limit is often set to 10 users, but you can reduce it to 1-2 if you only use the internet from your laptop. This will help conserve battery life and ensure that your primary device gets all the available bandwidth.
⚠️ Attention: When blocking a device by MAC address, make sure you don't block your own tablet or a second phone that may automatically try to connect to the network.
Additional settings and timeout
To save battery life, the Samsung A31 features a useful timeout feature. It automatically turns off the hotspot if no device is connected for a certain period of time. This option can be found in the menu. Settings -> Mobile hotspot -> Setting up -> Time-out.
You can select intervals from 1 minute to 10 minutes, or disable this feature entirely. If you use your phone as a fixed-line router, it's best to disable the timeout to prevent unexpected connection interruptions. For mobile use, setting a timer of 2-5 minutes will help prevent the situation where you forget to turn off the data connection and your phone runs out of battery in your bag.
Hidden Features of a USB Modem
If the Wi-Fi module is damaged or the signal is poor, you can use a USB cable to share the internet with your PC. This will ensure a more stable connection and simultaneously charge your phone.
Another important option is hiding the SSID. By activating this function Hide my device, you'll make your network invisible to public searches. You'll only be able to connect to it by manually entering the exact network name and password. This adds an extra layer of privacy, although it's not completely secure from advanced users.
Possible problems and solutions
Despite a well-functioning system, users may encounter situations where the internet is down or devices fail to detect the access point. One common cause is a glitch in the Android network stack. In this case, a simple smartphone reboot clears all temporary errors and re-registers the device on the carrier's network.
If devices see the network but can't connect, the problem may be an incorrect security type or password. Try changing the password to a simpler one (numbers only) to check if the characters are causing errors on the device you're connecting to. It's also worth checking to see if the number of connected users has been reached.
- 📶 Weak signal: Make sure your Samsung A31 phone has a strong mobile network connection. If the indicator shows 1-2 bars or EDGE, you won't have a stable connection.
- 🔒 Authorization error: On the device you are connecting to, select "Forget network" and try entering the password again, paying attention to the case of the letters.
- 📉 Low speed: Check if there are any heavy app updates running in the background of your phone that are taking up all your bandwidth.
In rare cases, the problem may be with the telecom operator, blocking data distribution. This is common with unlimited internet plans. Changing the TTL value can sometimes help bypass these blocks, but this requires more advanced technical knowledge and specialized applications.
Why does my phone's battery drain quickly when using WiFi?
Access point mode uses the radio module at maximum power to receive and simultaneously retransmit a signal from the tower. This places a high load on the processor and battery, causing heat generation and rapid power consumption.
Is it possible to share WiFi if it is connected to another router?
On most Samsung smartphones, including the A31, the Wi-Fi Repeater feature is not supported at the system level. The phone can function as either a Wi-Fi receiver or a Wi-Fi source (via mobile data), but not simultaneously.
How can I find out how much traffic was used for distribution?
There are often statistics in the access point settings, but more accurate data can be found in the section Settings -> Connections -> Use of data. It will show the overall mobile network consumption.