Modern smartphones such as Samsung Galaxy M21, are an integral part of digital life, providing access to information, entertainment, and work. However, without a stable connection to the global network, the device's functionality is severely limited. Users often face the need to quickly connect to a wireless network, whether at home, in the office, or in a public place. The setup process seems straightforward, but the operating system Android and the shell One UI There are nuances that can confuse an inexperienced owner.
In this article, we'll cover every step of activating a wireless module, from basic steps to troubleshooting complex technical issues. You'll learn how to select the right frequencies, configure static IP addresses, and optimize power consumption for long-term operation. Proper setup network parameters This will not only speed up content loading but also improve the security of personal data when using public hotspots. We'll review the algorithms relevant to current firmware versions to avoid errors when entering passwords or selecting encryption protocols.
Particular attention should be paid to the hardware features of the model. M21, which has a powerful battery, but requires proper radio module management. Incorrect configuration can lead to rapid battery drain or an unstable signal even in a strong reception area. Understanding the operating principles Wi-Fi Direct Dual-band networks will help you get the most out of your gadget. Let's get to the practical part and start the connection process.
Basic activation of the wireless module
The first step to accessing the internet is physically turning on the radio module. In smartphones Samsung There are two main ways to do this: through the quick settings panel or through the main settings menu. The fastest way is to swipe down from the top of the screen to open the notification shade. There, find the icon marked with a fan or arc symbol and tap it. If the icon is blue or green, the module is active and ready to search for networks.
More advanced settings are available through the system menu. To do this, go to Settings → Connections → Wi-FiThis section displays a complete list of available access points within range. The system automatically sorts them by signal strength, prioritizing those with the highest reception. It's important to note that when you first turn on your phone, you may be asked to allow geolocation to improve location accuracy.
After activating the slider in the menu, the device will begin scanning the airwaves. The list of available networks will be updated in real time. If you're at home, your network will likely be listed as "Saved" if you've previously entered a password. Otherwise, tap your router's name. The system will prompt you to enter a security key. Make sure you're using the correct keyboard layout and case-sensitive letters, as passwords are sensitive to these settings.
⚠️ Warning: When connecting to open public networks without a password (Open Wi-Fi), your data can be intercepted by attackers. Use such connections only to browse news feeds, but avoid entering passwords for banking apps or email.
Advanced settings and static IP
For most users, the automatic configuration provided via the protocol is sufficient. DHCPHowever, on corporate networks or if there are specific router limitations, manual address assignment may be required. To access these settings, in the list of available networks, click on the name of your access point and select "Advanced" or tap the gear icon next to the network name. In the menu that opens, find the "IP Settings" field and switch it from "DHCP" to "Static."
After selecting static mode, fields for manual data entry will appear. You will need to know the gateway IP address (usually the router's address, e.g., 192.168.1.1) and the subnet mask. In the "IP Address" field, you must enter a unique address for your Samsung M21 Within the same subnet, but outside the automatic range to avoid conflicts. For example, if your router assigns addresses from 100 to 200, your phone could be assigned address 50 or 250.
You can also configure DNS servers in this section. Using alternative DNS, such as 1.1.1.1 from Cloudflare or 8.8.8.8 Google's settings often speed up web browsing and bypass some ISP restrictions. This is especially helpful if your carrier's default servers are slow. After entering all the information, tap "Save," and your phone will attempt to reconnect with the new settings.
| Parameter | Description | Example of meaning |
|---|---|---|
| IP address | Unique address of the device on the local network | 192.168.1.150 |
| Gateway | Router address, Internet access | 192.168.1.1 |
| Network prefix length | Determines the network size (mask) | 24 |
| DNS 1 | Primary name server | 8.8.8.8 |
Works with 2.4 GHz and 5 GHz frequencies
Modern routers often transmit signals in two ranges: 2.4 GHz And 5 GHz. Model Samsung Galaxy M21 Supports both standards, giving users flexibility in choice. The 2.4 GHz band has a longer range and penetrates walls better, but it is often overloaded with signals from neighboring routers, microwave ovens, and Bluetooth devices. This can lead to slower speeds in apartment buildings.
The 5 GHz band offers significantly higher data transfer speeds and is less susceptible to interference due to its greater number of channels. However, its range is shorter and the signal has a harder time penetrating solid walls. If your router is in the same room as your phone, the 5 GHz network is preferable for watching 4K video or online gaming. One UI The phone automatically tries to select the best network if they have the same name (Smart Connect function).
Sometimes a situation arises where a phone "clings" to a weak 2.4 GHz signal, ignoring the faster 5 GHz. In this case, you can temporarily forget the 2.4 GHz network in the settings or rename the bands on the router, giving them different names. This will allow you to manually select which frequency to connect to at any given moment, balancing speed and connection stability.
What is the technical difference between the frequencies?
The 2.4 GHz band uses longer wavelengths, which are better at bypassing obstacles, but has only 13 non-overlapping channels. The 5 GHz band has shorter wavelengths and is less able to penetrate walls, but offers up to 23 channels and supports wider communication channels (80 MHz and higher), significantly increasing throughput.
Wi-Fi Direct and data sharing
The technology deserves special attention Wi-Fi Direct, which allows you to transfer files between devices without a router or internet connection. This is a built-in feature that turns your Samsung M21 into a hotspot for direct connection to another phone, tablet, or even a TV SamsungThe transfer speed is significantly higher than via Bluetooth, making the method ideal for transferring large video files.
To use this feature, you don't need to search for special apps. Just go to the menu Settings → Connections → Wi-Fi → Wi-Fi DirectThe phone will begin searching for available devices nearby. The receiving device must also have this mode enabled. Once detected, a connection request will appear on the screen, which must be confirmed. Once the connection is established, you can select files from your gallery or file manager and send them via the "Share" menu.
This mode also consumes more power than standard standby, so it's recommended to disable it after completing file transfers. This will help conserve battery life, which is critical for your smartphone's battery life.
- 📶 Allows you to transfer files at speeds of up to several hundred Mbps.
- 📱 Does not require a router or mobile Internet.
- 🔒 The connection is protected by the WPA2 protocol, the key is generated automatically.
- ⚡ Drains battery faster than normal standby mode.
⚠️ Note: Menu interfaces may vary slightly depending on your Android version and One UI updates. If you don't see Wi-Fi Direct, search for it in Settings.
Optimization and energy saving
Smartphone Samsung M21 is known for its impressive battery life, largely due to system optimization. However, constantly searching for networks or a weak signal can quickly drain the battery. In the battery settings, there's a "Power Saving Mode" feature that can limit background network activity. If you notice delayed notifications or Wi-Fi disconnecting in sleep mode, check these settings.
Go to Settings → Device Maintenance → Battery → Background RestrictionsHere you can add frequently used apps to the "Unrestricted" list so that the system doesn't disable their network access to save power. You should also disable the "Switch to Mobile Data" feature if you don't need it. This option forces the phone to constantly monitor the Wi-Fi signal quality and switch to 4G if the Wi-Fi connection is slow, resulting in double data and battery consumption.
Another useful tool is resetting network settings. If your phone starts glitching, losing connection, or not seeing known networks, don't rush to perform a full factory reset. Clearing network configurations is sufficient. This will reset Wi-Fi, Bluetooth, and mobile network settings to their default values, deleting saved passwords and VPN settings but preserving your personal files and apps.
☑️ Diagnosing Wi-Fi problems
Common problems and solutions
Even with proper configuration, users may encounter connection errors. One of the most common issues is the "Obtaining IP address..." status, which persists indefinitely. This often indicates an address conflict within the router's network or a DHCP pool overflow. The solution is to reboot the router or manually assign a static IP address, as described above. It's also worth checking whether MAC address filtering is enabled on the router.
Another common situation is when the phone connects, but the internet doesn't work. First, check if the internet is working on other devices. If so, the problem may be with the wrong time on your smartphone. Desynced date and time disrupt security protocols (SSL/TLS), causing pages to fail to load. Set automatic time synchronization via the network in the settings. General Settings → Date and Time.
If all else fails, reset your network settings. Path to this function: Settings → General Settings → Reset → Reset Network SettingsAfter this operation, the phone will reboot, and you will need to re-enter passwords for all Wi-Fi networks. This action resolves 90% of software errors related to the operating system's network stack.
- 🔄 Reboot your router by unplugging it for 10 seconds.
- 📅 Check that the date and time are set correctly on your device.
- 🗑️ Use the "Forget Network" feature for the problematic access point.
- 🛠️ Reset network settings in the Android system menu.
FAQ: Frequently Asked Questions
Why can't my Samsung M21 see my Wi-Fi network, even though other devices do?
The router may be operating in a mode unsupported by the phone (for example, only 5 GHz on a specific channel), or the network may be hidden. Try rebooting the router, updating the broadcast channel in its settings, or checking if MAC address filtering is enabled.
How do I find the password for a saved Wi-Fi network on a Samsung?
On Android 10 and higher (including One UI), you can view the password. Go to Wi-Fi settings, tap the gear icon next to your active network, then select the "Share" button or QR code. The password will be listed under the QR code, or you can scan it on another phone.
Does the case affect Wi-Fi reception?
Yes, cases with metal inserts or a thick layer of metal can shield the signal and reduce reception. If you're experiencing connection issues, try removing the case and checking the signal strength.
Is it possible to distribute Wi-Fi received via Wi-Fi (repeater mode)?
You can't share Wi-Fi data via Wi-Fi using standard Android tools (only via USB or Bluetooth). Creating a repeater requires special root access or external hardware.