The modern smartphone has long since ceased to be simply a means of communication, becoming a universal tool for solving work tasks anywhere in the world. Owners of popular Chinese smartphones often face the need to provide internet access to their laptop or tablet when a fixed router is unavailable. The ability to create a personal wireless network is built into the MIUI interface, but setting it up correctly has its own set of considerations that affect connection speed and stability.
In this article, we will examine in detail the process of activating the modem mode on the device. Redmi Note 9 Pro, focusing on the nuances of frequency range selection and data security. You'll learn how to optimize power consumption when distributing data and which parameters should be adjusted for maximum signal coverage. Proper configuration will help you avoid common mistakes and ensure the smooth operation of your connected devices.
Using your smartphone as a router is a great solution for business trips, studying, or working in a cafe. However, it's worth remembering that mobile Internet has traffic limits, so it's important to monitor your data usage. Below are proven setup methods to help you quickly set up a local network.
Preparing the device and checking the tariff plan
Before you start activating your access point, you need to make sure that your Redmi Note 9 Pro Ready to use as a modem. First, make sure you have a SIM card with an active data plan and a strong cellular signal. Carriers often block or limit the speed of SIM cards used in modems, so make sure your plan allows you to share data with other devices.
⚠️ Please note: Some mobile operators may charge an additional fee for tethering or throttle your speed to 64-128 kbps. Be sure to check your plan's terms in your operator account before using active tethering to avoid unexpected charges.
It's also critical to assess the battery's charge. Hotspot mode significantly increases the load on the processor and radio module, leading to rapid battery drain. If you're planning a long session, it's recommended to connect the phone to a power source or a power bank. Overheating is another factor that can cause the feature to automatically disable.
Make sure mobile data is enabled on your device. This is a basic requirement, as tethering is physically impossible without it. Check if "Data Saver" mode is enabled, as this could block background processes or limit the speed for connected clients.
- 📱 Check your balance and remaining gigabytes in your operator's app.
- 🔋 Charge the battery to at least 50% before starting distribution.
- 📡 Make sure the 4G/LTE icon is displayed in the status bar.
- 🌡️ Remove any thick case if your phone is prone to overheating.
Activating the access point through system settings
The main and most reliable way to enable router mode on Xiaomi Redmi Note 9 Pro — using the system settings menu. This method provides access to all necessary configuration parameters, allowing for flexible network management. To get started, unlock the screen and find the icon Settings, which usually looks like a gear.
In the menu that opens, find the section Access point and modemDepending on the MIUI firmware version, this item may be located directly in the main list or hidden inside a submenu. Connection and sharingAfter the transition, you will see a switch Wi-Fi hotspot, which is off by default. Enable it by tapping the slider.
☑️ Check before switching on
Once enabled, the system automatically creates a network with a name based on your device model and protects it with a password. However, the default settings aren't always optimal. It's recommended to immediately go to the access point configuration menu to change the network name (SSID) to something more recognizable and set a strong, hard-to-guess password.
⚠️ Note: The MIUI interface may vary slightly depending on your Android version and regional firmware. If you can't find the options listed, search for "hotspot" or "modem" in the settings.
It's important to note that when Wi-Fi hotspot is enabled, the 2.4 GHz Bluetooth connection may become unstable or even disconnect. This is due to the antenna module's inherent limitations, which prevent it from effectively handling two different protocols simultaneously in the same frequency band without loss of quality.
Setting up security and selecting a frequency range
Data security is a top priority when setting up a wireless network. In the access point settings on Redmi Note 9 Pro You can choose the encryption protocol. The default is WPA2-Personal, which is the optimal choice for compatibility with all modern devices. Older standards, such as WEP, are not supported due to their low security.
Particular attention should be paid to the choice of frequency range. In the menu Setting up an access point -> Frequency range You can choose between 2.4 GHz and 5 GHz. The 2.4 GHz band provides greater range and wall penetration, but it's often congested by neighboring routers, reducing speed. The 5 GHz band offers significantly higher speeds and less interference, but has a shorter range.
What is the difference between 2.4 GHz and 5 GHz?
The 2.4 GHz band is better suited for use in large rooms or outdoors, where range is more important than speed. It's compatible with all devices, even very old ones. The 5 GHz band is ideal for watching 4K video, online gaming, and downloading large files, but the signal can be lost through two or more concrete walls. Redmi Note 9 Pro, which supports the Wi-Fi 5 standard, using 5 GHz will allow you to achieve the maximum speed of mobile Internet.
When setting a password, use a combination of uppercase and lowercase letters, numbers, and special characters. The password should be at least 8 characters long, but 12-15 characters is ideal. Avoid using obvious combinations, such as dates of birth or sequences of numbers.
| Parameter | Recommended value | Impact on work |
|---|---|---|
| Security protocol | WPA2-Personal | Maximum compatibility and protection |
| Frequency range | 5.0 GHz | High speed, less interference |
| Frequency range | 2.4 GHz | Longer range, better penetration |
| Hiding the network | Off | Makes it easier for new devices to find the network |
Managing connected devices and limits
Control over connected clients is an important feature to prevent unauthorized access and channel congestion. In the access point menu Redmi Note 9 Pro A list of all devices currently using your internet connection is displayed. Here you can see the MAC address and name of each device.
The system allows you to set a limit on the number of connected devices. By default, this parameter is often set to 10, but to save data and battery, it's best to reduce it to 3-5. If an unnecessary device attempts to connect to the network, it will be denied access. This also helps prevent situations where neighbors "suck into" your Wi-Fi without permission.
There's also an option to automatically turn off the access point if no one connects to it for a certain period of time (e.g., 5 or 10 minutes). This is a useful battery-saving feature that prevents the radio module from idling. It can be activated in the additional settings of the sharing menu.
It's important to periodically check the list of connected devices. If you spot a stranger, immediately change the password and reboot the access point. Some modern viruses and malware may attempt to scan open or poorly secured networks for vulnerabilities.
- 👥 Set a connection limit:
Settings->Device management. - ⏱️ Set the auto-off timer to save energy.
- 🚫 Use the "Blacklist" to block unwanted guests.
- 📊 Monitor the volume of transferred data in real time.
Sharing the Internet via USB and Bluetooth
Although Wi-Fi is the most popular method of distribution, Redmi Note 9 Pro It also supports alternative options that can be useful in specific situations. A USB modem allows you to share your internet connection with your computer via a cable. This ensures a more stable signal and simultaneously charges your phone, eliminating the problem of rapid battery drain.
To activate the USB modem, connect your phone to the PC with a high-quality cable. Then, in the menu Access point and modem activate the switch USB modemThe computer automatically recognizes the new network connection, as if a wired Ethernet cable were connected. This method is especially useful for desktop PCs without a Wi-Fi adapter.
Bluetooth modem is a legacy technology that's rarely used today due to its low data transfer speed (maximum 2-3 Mbps). However, it can be a lifesaver in emergency situations when you need to transfer a small amount of text information or check email when other methods are unavailable. To use, you need to pair your phone and the receiving device via Bluetooth, then turn on the corresponding switch in the modem menu.
It's worth noting that when using a USB cable for internet sharing, the speed may be limited by the cable's bandwidth. Cheap "charging-only" cables won't work—you need a data cable, preferably an original or certified one.
Solutions to common problems and errors
During setup, users may encounter a situation where devices don't see the network or can't connect to it. One common cause is incompatibility between security standards or frequency bands. If the laptop is older, it may not support the 5 GHz band, so switching to 2.4 GHz often resolves the network visibility issue.
Another common error is the message "Unable to obtain an IP address." This can be caused by a problem with Android's network settings. In this case, resetting network settings can help: go to Settings -> Connection and sharing -> Reset Wi-Fi, Mobile Networks, and BluetoothAfter restarting the phone, the problem can usually be resolved.
⚠️ Note: Resetting network settings will delete all saved Wi-Fi network passwords and Bluetooth pairings. Be prepared to re-enter your home and work network passwords after this procedure.
If the connected device has internet access but pages aren't loading, check your DNS settings. Sometimes ISPs block access or DNS servers are slow. You can try setting a static DNS, such as Google's, in your hotspot settings (8.8.8.8) or Cloudflare (1.1.1.1), although on the mobile interface this option may be hidden and require third-party applications.
It's also worth considering that some data-saving apps or antivirus programs may block the hotspot. Try temporarily disabling third-party firewalls or optimization software to check their impact on modem performance.
Optimizing connection speed and stability
To achieve maximum network performance, Redmi Note 9 Pro It's recommended to choose a location with the best cellular signal. Place the phone closer to a window or raise it higher. Metal structures and thick walls can block the signal, so avoid placing the phone in alcoves or behind appliances.
Close background apps that actively consume data on your phone. Game updates, photo syncing to the cloud, or downloading large files can choke your bandwidth, leaving minimal bandwidth for connected devices. Use the built-in traffic monitor to track which apps are using the most data.
Restarting your access point periodically helps clear the network service cache and restore connection stability. If you use tethering for several hours a day, turn tethering off and on every 2-3 hours. This also helps cool the device and extends battery life.
- 📍 Place your phone in an area with strong 4G/LTE coverage.
- 📉 Close heavy apps on your phone while sharing.
- 🔄 Restart your access point if your speed drops.
- 📵 Turn off notifications and syncing while working.
Is it possible to share Wi-Fi if there is no SIM card on the phone?
No, tethering requires an active SIM card with a data plan that includes data. However, if the phone is connected to a Wi-Fi network, some models (depending on the MIUI version) allow signal retransmission. However, on the Redmi Note 9 Pro, this feature is often blocked by software or works intermittently without third-party software.
Why does my laptop see the network, but it says "No Internet access"?
Most often, this means the phone's cellular signal has been lost or data has run out. The problem could also be with incorrectly configured APN (access point name) settings from your carrier. Check whether websites can be accessed on the smartphone itself via the mobile network.
How many devices can be connected to Redmi Note 9 Pro at the same time?
Technically, MIUI allows you to connect up to 10 devices. However, the actual number depends on the processor load and available RAM. For a comfortable experience, it's recommended to connect no more than 3-5 devices simultaneously to ensure sufficient speed for all.
Does Wi-Fi sharing affect the speed of mobile internet on the phone itself?
Yes, it does. The bandwidth is shared between all connected clients. If you're playing a video on a laptop, page loading speeds on the phone itself may noticeably decrease, as the radio module operates in half-duplex mode, alternately receiving and sending data.
How to hide your network from strangers?
In the access point settings Redmi Note 9 Pro There's a "Hide Device" option. If enabled, the network won't appear in the general list of available Wi-Fi networks. To connect, you'll need to manually enter the network name (SSID) and password in the Wi-Fi settings on the receiving device.