Owners of the popular Xiaomi Redmi Note 8 Pro smartphone periodically face a situation where the quality of mobile communication leaves much to be desired, this can manifest itself in a call cliff, a long dial or a sudden switch from 4G to a slower E. The problem often lies not in the malfunction of the device itself, but incorrect software settings or modem features after updates.
Stable signal reception is critical for the modern user who uses the smartphone not only for calls, but also for work, navigation and entertainment. In this article, we will discuss in detail the software and hardware methods that can significantly improve the quality of communication on your device. You will learn about the hidden functions of the engineering menu, the right choice of frequencies and the nuances of working with the Internet. SIM-map.
Basic diagnostics and operator selection
Before you start to manipulate the system files in a complex way, you need to rule out the common causes of the bad signal. SIM-maps or network coverage in a specific location. SIM-The card has no mechanical damage and sits tightly in the tray. 5-7 years ago, modern encryption and frequency standards may not support, which directly affects the stability of the connection.
It is also worth checking the relevance of the access point settings (APN) The wrong settings can cause low Internet speeds, even if the signal level is full. → SIM-maps and mobile networks → Choice SIM-map → Access points (APN) And make sure you have the right profile, and if you don't have the settings, you can automatically get them by sending a request to a short operator number or by downloading a profile from the official website.
It is also important to consider the physical location of base stations: in basements, metal structures of buildings or remote rural areas, the signal may be weak for objective reasons, in which case software methods will only give temporary or minimal effect.
- 📱 Check if the tray is closed. SIM-card with a protective cover with a metal back panel.
- 📡 Compare the signal strength with another phone of the same operator at the same point.
- 🔄 Try to rearrange. SIM-card to the second slot, as the modem can allocate resources in different ways.
⚠️ If the communication on other devices of the same operator is excellent, and on the Redmi Note 8 Pro is problematic, then it means that it is the settings or hardware of your smartphone that is the main reason for this.
Configure the preferred type of network
One of the most common causes of unstable communications is the constant search for 4G (LTE) networks in areas of uncertain reception. The smartphone constantly “jumps” between 3G and 4G standards, which leads to connection breaks during calls. Forced switching to 3G only or 2G mode in certain situations can dramatically improve the stability of voice communication.
To change the priority of networks go to Settings → SIM-maps and mobile networks → Choice SIM-map → The preferred type of network. You can select the "Preferred" option here. LTE", "Only 3G" or "2G/3G (vehicle)” If you are in the area where 4G snatch (1-2 divisions), but 3G stable, it makes sense to temporarily limit the operation of the modem.
However, it is worth remembering that 2G (GSM) is being phased out by operators in many regions, so its use may not be feasible in the long run.The optimal option for most users is Prefer LTE mode, but with manual frequency settings through the engineering menu, which will be discussed below.
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Forced 3G turn on often saves the situation in buildings with thick walls, where the 4G signal can not break through, but 3G voice frequencies pass better.
Work with engineering menus (CIT and hidden codes)
To further customize the radio module in Xiaomi smartphones, there is a special engineering menu that allows you to access the hidden parameters of the antenna and select the specific frequencies on which the base station operates, which is the most effective way to “register” a phone for a specific operator in a difficult air environment.
To enter the testing menu, open a standard phone and dial the code ##4636##. If the code doesn’t work, it may be blocked in your firmware region. In this case, you can try an alternative path through the Service and Feedback app (yellow icon with tools), where you need to click 5 times on the icon version of MIUI or find the CIT section. In the menu that opens, select Phone Information.
You'll see a lot of options in this section. We're interested in the drop-down list of Set Preferred Network Type, where you can choose specific combinations, such as LTE Only (4G only) or WCDMA Only (3G only), and be careful: if you select LTE Only, you may not be able to receive incoming calls if your carrier does not support VoLTE.
- 🔍 Use the regimen "LTE Only" for Internet speed test only, remembering to return settings back.
- 📶 Follow the Signal Strength parameter to estimate the actual signal strength in dBm.
- 🚫 Do not change the values in other sections of the engineering menu without an accurate understanding of their purpose.
⚠️ Attention: Incorrect frequency settings in the engineering menu can lead to a complete lack of communication!
What if the code doesn't work?
Resetting network settings and updating configuration
Accumulation of errors in network configurations is a common cause of problems after a system update or change SIM-Network resets bring all modem, Wi-Fi and Bluetooth settings back to factory values, eliminating software conflicts. It's a secure procedure that doesn't affect your personal files, photos or contacts.
To perform the reset, go to Settings → Connection and Sharing → Reset Wi-Fi, mobile network and Bluetooth. Press Reset button at the bottom of the screen. After the smartphone is restarted, the system will re-register in the operator's network, receiving the current settings.
Also worth checking for system updates. Xiaomi engineers regularly release patches that fix the radio part. Go to Settings → About Phone → MIUI version and click "Check Updates." If new software is available, be sure to install it by pre-charging the battery.
☑️ Checklist before network reset
Hardware factors and the influence of accessories
The Redmi Note 8 Pro has multiple antenna modules around the perimeter of the body, if the phone falls, the antenna contact inside could move away or oxidize, and some security accessories can shield the signal.
Especially negative on reception affect cases with metal inserts, magnetic fasteners or too thick a layer of plastic. Metal creates a "Faraday cage" by blocking radio waves. Remove the case and check the signal level — if it grew by 1-2 divisions, the problem was in the accessory.
Also pay attention to the condition of the tray. SIM-If the rubber seal is worn or torn, moisture and dust may enter the interior, causing the contacts to oxidize. SIM-map: they must be golden in color without black spots.
| Influence factor | Symptoms. | Decision |
|---|---|---|
| metal case | A sharp drop in signal strength | Replacement of the case with plastic/silicon |
| Old one. SIM-map | Long network search, registration errors | Replacement of SIM-card from the operator |
| Tray pollution | Disappearance of the network during vibration | Cleaning the tray and contacts with alcohol |
| Battery discharge | Reduced transmitter power | Charging device above 20% |
Use of third-party applications and radical measures
If the regular funds don't work, you can use specialized software. Applications like Network Cell Info Lite or Signal Check Pro let you visualize the signal, understand which tower the phone is connected to, and find the "dead zones" in the room. They don't amplify the signal magically, but they help you find the best place to place your smartphone.
In extreme cases, if the problem has appeared after a failed update or installation of questionable modifications, you may need a full reset to factory settings (Hard Reset).Be sure to back up all data to the Mi Cloud cloud or computer, as all information will be deleted.
Sometimes it helps to flash the device to the global version of MIUI or vice versa to the Chinese version, if certain frequencies are better in your region, but this is a complex process that requires unlocking the bootloader, and it is only necessary for experienced users to perform it.
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Try turning the Reim Flight on and off every 2-3 hours, which causes the modem to re-scan the airwaves and connect to the nearest and least busy base station.
⚠️ Note: Installing applications from unknown sources to “boost the signal” is often a fraud, and these programs only change the system settings that are available without them, and may contain viruses.