Modern smartphones have long since become universal tools that can replace many gadgets, and Redmi 9A from the company Xiaomi is no exception. In situations where there is no wired internet or a stationary router has failed, a mobile device becomes a lifesaver, providing network access to laptops, tablets, and other devices. The process of turning a smartphone into a fully-fledged mobile router simplified as much as possible by the shell developers MIUI, however, it has a number of nuances, knowledge of which will help avoid connection problems.
In this article, we'll cover every step of setting up an access point, from basic setup to fine-tuning settings for maximum speed and security. You'll learn how to correctly select the frequency range to avoid interference and which settings will help conserve battery life, which is quite drained when actively sharing. We'll also cover security issues to prevent unauthorized access to your network.
Understanding wireless communication principles at the operating system level Android This will allow you to manage your traffic intelligently, rather than simply pressing a button. This is especially important for those with limited gigabyte plans, where every megabyte counts. Let's look at how to make the sharing process as efficient and secure as possible for your device and data.
Basic Wi-Fi hotspot setup
The first step to activating tethering mode is to enter the corresponding operating system settings menu. On smartphones Xiaomi with shell MIUI The path to these parameters is standardized, but may vary slightly depending on the firmware version. You need to open the main menu and find the icon Settings, which usually looks like a gear. Next, go to the section Wi-Fi hotspot, which is often located in the connection settings group or placed in a separate submenu.
After navigating to the desired section, you'll see a switch that activates the sharing function. However, simply enabling it isn't enough for stable operation. You'll need to configure a network name (SSID), which will be displayed on connected devices, and set a strong password. By default, the system may suggest a standard model name, but it's best to create a unique name to easily identify your network in the list of available connections.
Particular attention should be paid to the choice of security protocol. In today's reality, the only reasonable choice is a standard. WPA2-Personal or newer WPA3, if supported by the devices you're connecting to. Using outdated protocols or an open network without a password makes your transmitted data vulnerable to interception and allows anyone to use your mobile data.
If the icon doesn't appear or is grayed out, check your mobile internet connection. The hotspot won't be able to broadcast a signal if your SIM card doesn't have data activated or your data plan has run out.
⚠️ Note: When you first activate the hotspot, the system may request permission to use geolocation. This is a requirement of the operating system. Android is necessary for the correct operation of network scanning, and it must be confirmed for the stable functioning of the Wi-Fi module.
Selectable frequency range: 2.4 GHz or 5 GHz
One of the key settings that affects the speed and range of the signal is the choice of frequency range. In the access point settings on Redmi 9A the option to switch between ranges is available 2.4 GHz And 5 GHzEach has its own advantages and disadvantages, depending on the usage conditions and the characteristics of the connected devices. Understanding the differences between them will help you choose the best option.
The 2.4 GHz band is the most common and compatible. It provides good coverage and penetrates walls and obstacles better than its high-frequency counterpart. However, due to the large number of devices operating in this band (from microwaves to Bluetooth headsets), interference is common, which can reduce actual connection speeds.
The 5 GHz band offers significantly higher data transfer rates and is virtually interference-free in apartment buildings. However, its range is shorter, and the signal has poorer penetration through physical barriers. Furthermore, older devices may simply not see the network operating on this frequency, as their Wi-Fi modules do not support this standard.
To set the range, follow these steps:
- 📡 Go to the menu
Wi-Fi hotspotand select the itemSetting up an access point. - 📡 Find the line
Frequency range(orAP Band). - 📡 Select a value
2.4 GHzfor maximum compatibility or5.0 GHzfor high speed.
If you're unsure which band to choose, start with 2.4 GHz. This is a universal option guaranteed to work on any laptop or tablet. Switching to 5 GHz only makes sense if you're sure the receiving device supports it and is within close proximity to your smartphone.
Setting up security and password
Securing your personal hotspot isn't just a formality, it's a necessity. Since you're sharing the internet using your own money and SIM card, network access should be strictly limited. In the settings Redmi 9A A robust encryption mechanism is in place to protect transmitted data from prying eyes. Ignoring these settings may result in the leakage of personal information or unauthorized use of traffic.
Your password should be complex enough to be difficult to guess by automated programs, but still easy to enter on a friend's or colleague's device. It's recommended to use a combination of uppercase and lowercase letters, numbers, and special characters. The password should be at least 8 characters long, although the system may allow shorter passwords, which are not recommended.
You can also hide the network name (SSID) in the security menu. If you activate this function Hidden network, your device won't broadcast the access point's name in the general list. Connecting to such a network is only possible manually, by accurately entering the name and password. This creates an additional barrier for casual users, although it's not insurmountable for experienced hackers.
| Security parameter | Recommended value | Impact on safety |
|---|---|---|
| Encryption type | WPA2-Personal | High (industry standard) |
| Password length | 12+ characters | Critically important |
| Hiding the SSID | As desired | Average (protection from curious people) |
| MAC filter | Whitelist | Maximum (access only to selected people) |
Some users prefer to skip the password hassle and use WPS for a quick connection, but this method is often unavailable or inconveniently implemented on mobile devices. Therefore, manually entering a strong password remains the most effective security method. Avoid using birthdays, simple sequences like "12345678," or dictionary words as passwords.
⚠️ Note: The security settings interface may be updated with the release of new MIUI versions. If you don't see the described options, check the location of the elements in the official manual or on the manufacturer's current support page.
Managing connected devices
Controlling who connects to your network is an important part of access point management. Shell MIUI provides a convenient tool for monitoring active clients. In the access point menu, you can always see a list of devices currently using your internet connection. This allows you to quickly identify uninvited guests and block their access.
If you notice a device you don't recognize, or simply want to limit the number of connections to maintain speed, you can set a limit. The system allows you to set the maximum number of users that can simultaneously connect to your smartphone. Once this limit is reached, new devices will be unable to log in, even with the correct password.
☑️ Network security check
To block a specific user, simply click on their name or icon in the list of active connections and select "Block." This will blacklist the device and prevent it from connecting again until you grant it access. This is an effective way to combat "spam" that may be slowly downloading files in the background.
It's also worth remembering that active network use by multiple users simultaneously can significantly reduce speed for each user. Mobile processor and radio module Redmi 9A have their own performance limits. If you feel your internet is slow, check if anyone on your network is downloading heavy content, such as high-definition videos.
Optimizing power consumption and battery
Sharing Wi-Fi is one of the most power-hungry processes for any smartphone. The radio module operates in overdrive, constantly transmitting data, which leads to rapid heating of the device and intense battery drain. For owners Redmi 9A You should be especially careful, as the battery capacity, although large, is not unlimited, and the processor does not have the excessive energy efficiency of flagships.
To minimize power consumption, it's recommended to reduce screen brightness or turn it off completely after setting up the hotspot. The screen is one of the largest energy consumers, and leaving it in standby mode while actively sharing data isn't beneficial. You can also enable power saving mode, but be sure it doesn't disable background data transfer.
Why does the phone get so hot when distributing?
When the Wi-Fi module is actively operating in access point mode, the processor and radio components generate a significant amount of heat. This is a normal physical process, but to prevent overheating, the system may automatically reduce the transmission speed or disable the access point.
If you plan to use your smartphone as a stationary router for an extended period, it's best to connect it to a power source. However, be careful about the temperature of the device. Excessive heat is harmful to the lithium-polymer battery and can shorten its lifespan. Using a hotspot in hot weather or in direct sunlight can be dangerous for the device.
There's also an option to automatically turn off the hotspot. You can set a timer after which, if no one is connected to the network or there's no activity, the hotspot will stop sharing. This is a useful feature that prevents you from forgetting to turn off the hotspot and running out of battery just in time for an important call.
Solving problems and limitations
Despite the simplicity of setup, users may encounter a number of common issues. One of the most common is when devices see the network but are unable to connect, or when a connection is established but the internet is not working. This is often due to the mobile operator's APN settings or a tethering ban by the provider.
Some mobile operators block or charge separately for internet sharing with other devices. They determine this based on the value TTL (Time To Live) data packets. If this is your case, standard system tools won't solve the problem; it requires more in-depth knowledge and changing system parameters, which can be difficult for the average user.
It is also worth considering the technical limitations of the smartphone itself. Redmi 9A It's a budget device, and its ability to handle multiple connections simultaneously is limited. If you try to connect 5-6 laptops and start downloading large files, the phone may start to lag or drop connections.
⚠️ Please note: Internet tethering pricing terms are subject to change by telecom operators without prior notice. Before using the hotspot, please check the current terms in your personal account or contact your operator's support team.
If the internet on the connected device is slow, try switching it to the 5 GHz band (if supported) or moving it away from sources of interference. Restarting the Wi-Fi module on your smartphone also helps: turn the hotspot off and then back on. In rare cases, you may need to completely reset the network settings in the menu. More → Reset Wi-Fi, Mobile Networks, and Bluetooth.
Why isn't Wi-Fi hotspot working after updating MIUI?
After updating the firmware, the access point settings may be reset or a software conflict may occur. Try re-creating the access point with a new name and password. If this doesn't help, check if you have any traffic limits set in the Security app settings.
Is it possible to share Wi-Fi if airplane mode is enabled on the phone?
No, in airplane mode, all wireless modules are disabled. However, on many smartphones, you can enable airplane mode and then separately enable Wi-Fi. However, tethering still requires a mobile network (3G/4G), so airplane mode must be disabled.
How do I find out who is connected to my Wi-Fi?
Go to your hotspot settings and tap "Connected devices." This will display a list of all devices currently using your internet connection, along with their MAC addresses.
Does Wi-Fi sharing affect the speed of mobile internet on the phone itself?
Yes, it does. The connection is shared between devices. If a connected laptop starts downloading a large file, the smartphone's internet speed will also drop, as the radio module operates in time-sharing mode.