Xiaomi smartphone owners often encounter mysterious acronyms in engineering menus or in-depth analysis of system logs. One of these acronyms is PRL, whose value for the average user remains a mystery behind seven seals, which many confuse with firmware updates or APN settings, although it is a completely different level of device interaction with the cellular network.
In essence, the PRL (Preferred Roaming List) is a special list stored in the phone’s memory that tells the phone which base stations it prefers to connect to in the absence of a native network. In today’s world, when roaming is virtually abolished in the country, and operators are actively using refarming technologies, this list becomes an optimization tool, not just a relic of the past.
If you notice that your Xiaomi Redmi or Poco catches the network for a long time after leaving the coverage area or constantly “jumps” between 3G and 4G standards, the problem may lie in the relevance of this list. Understanding the mechanics of PRL will help you correctly configure the device for stable signal reception.
What is PRL and how does it work for Android?
Technology PRL It was originally developed for the standard network. CDMA, where the phone had to know clearly the priority of the base stations to register on the network. GSM/LTE Networks where priorities are set in real-time network settings CDMA The roaming list of preferred roaming was written hard in the device's memory, but with the advent of hybrid modems and the VoLTE standard, the mechanism was not the same. PRL It has become used in devices based on Qualcomm Snapdragon, which are in most Xiaomi smartphones.
When you move between cities or are on the edge of coverage, your smartphone scans the airwaves. If the signal from the home operator weakens, the device turns to the PRL to find an available network to register. The list list lists operator codes (SID/NID), which are sorted by priority, which allows the phone not to waste time bruising all frequencies, but immediately try to connect to the most suitable partner of the home operator.
It's important to understand that in today's environment, PRLs are not just roaming lists abroad; they affect how quickly a phone reattachs to a tower after a signal loss or reboot, and an outdated list may contain information about closed frequencies or not take into account new bands that your carrier has recently started using.
⚠️ Attention: PRL It has nothing to do with your data plan or balance, it's just a technical modem configuration file that's responsible for physically connecting to base stations.
The mechanism for updating this list can occur automatically (OTA), but on custom firmware MIUI or HyperOS, this process sometimes fails, which is why users with advanced levels of technology sometimes resort to manual activation or checking the relevance of the list through special codes.
The Impact of PRL on Mobile Internet Speed
There's a common misconception that the PRL magically update increases the top speed of the Internet. It's not quite true. The list file itself doesn't expand the channel, but it optimizes the base station selection process. If your phone gets stuck on a congested 3G tower while 4G is running nearby, the right PRL will help the device switch to a faster standard.
In situations where the operator is performing maintenance or changing the network configuration, the old settings in the phone can lead to an unstable connection. In such cases, the PRL acts as a navigator that redirects your Xiaomi Mi or Redmi Note requests to current frequencies, this is especially noticeable in areas of uncertain reception, where every decibel of the signal is important.
If you see persistent connection breaks or pages loading long while the signal is fully displayed, it may be that the phone is connected to a low-bandwidth repeater. Resetting or updating network settings that include working with PRL can solve this problem by forcing the modem to re-find the optimal access point.
It’s worth noting that the impact on speed will only be noticeable when the current network settings are incorrect, and if you’re working perfectly, a forced PRL update will not increase performance, because you can’t optimize what you already optimize.
Where to find and how to check your PRL settings on Xiaomi
In the standard MIUI, hidden modem and PRL settings are not normally available to the average user. To access these features, you need to use an engineering menu or special codes. Smartphones with Qualcomm processors (which is most Xiaomi models) use code to log into the test menu.
To start checking, type the following code in your phone book: ##4636##. If the code doesn’t work (which is often the case on newer versions of Android or in some regions), you may need to install a special activator application or use it. ADB-In the "Phone Information" menu that opens, you can see the current status of the network, but the direct "Update" button. PRL" there may not be.
The deeper level of access is via the #83784662## (QXDM/Engineering Mode) menu, but the interface is complex and requires knowledge. For most users, it is safer to use standard network reset tools that initiate a request for an actual PRL from the operator.
adb shell service call phone 70 i32 1This command, executed via a computer with an ADB installed, may initiate a network profile update on some devices. However, using the command line requires caution. Incorrectly entering parameters can lead to temporary inoperability of the communication module.
☑️ Checking before updating the network
Do I need to update PRL: myths and reality
In the Xiaomi enthusiastic community, there is a myth that regular PRL updates are the panacea for all the woes of mobile, and the reality is that today's carriers themselves (push) are the actual device settings for every sign-up on the network, so manual intervention is extremely rare.
The meaning in manual PRL update appears only in three cases: after flashing the phone to custom assembly (where regional settings could fly), after changing the operator (especially when switching from CDMA-like standards, although in Russia and the CIS this is rare), or with obvious failures in the modem. In other cases, the system itself keeps the list up to date.
Frequent forced updates can, on the contrary, load the processor and modem, causing increased battery consumption. The myth that “the more you update, the faster the Internet” has no technical basis.
| Situation | Will the PRL update help? | Recommended action |
|---|---|---|
| Slow internet in the city | Hardly. | Check the APN settings and access point |
| No network after traveling abroad | Yeah, probably. | Enable manual network selection or update profile |
| Phone doesn't see 4G/LTE | Maybe. | Reset network settings to factory |
| Frequent call breaks | Unlikely. | Check it out. SIM-map |
So the PRL update is a diagnostic and recovery tool, not a means to continually tune your speed. Use it only when there are real connectivity issues that are not solved by a simple reboot.
Instructions: Safely reset network settings
Since a direct interface to work with PRL into MIUI No, the most effective and secure analogue that causes the phone to re-query the current list from the operator is resetting the network settings. PRL and APN, The schemas that are relevant to your SIM-map.
To do this, go to your Xiaomi's settings menu. Find the connection section. The path may vary slightly depending on the shell version, but the logic remains the same. Press the reset button and confirm the action.
What happens after resetting the network settings?
After the procedure is completed, the phone can restart itself. 2-5 The device will search for the network and log in to it. PRL If the signal problem persists after that, it's worth trying to extract it. SIM-wipe the contacts and paste them into another slot (if there are two) to exclude physical contact.
⚠️ Note: Before resetting your network settings, make sure you remember passwords from important Wi-Fi networks, as they will be deleted from your device’s memory irrevocably.
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If the Internet doesn't show up after resetting, try turning on Flight Mode for 10 seconds and then turning it off, which will force you to re-register the network with new parameters.
Alternative methods for solving communication problems
If the network settings are not manipulated, the problem can go deeper. Often, speed and stability are not affected by the parameters. PRL, a) physical condition SIM-Xiaomi owners can check for system updates, as security patches often come with fixes for the radio module.
You should also pay attention to the settings of the type of network. → SIM-maps and mobile networks → Network type, try to switch mode. For example, force "Only" LTE" or, conversely, allow"3G/2G". Sometimes automatic mode works incorrectly in areas with unstable coating, and fixing on one standard gives a better result than constant attempts to switch.
In extreme cases, when software methods are powerless, replacement helps. SIM-Older cards, especially those issued more than 5 years ago, may not work properly with modern encryption standards and frequencies, which is perceived by the user as a problem of the phone.
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The comprehensive approach (setting reset + SIM check + system update) solves 95% of communication problems, making manual PRL intervention unnecessary for most users.
Conclusion
If you look at the PRL in a Xiaomi phone, it's an important system component, not a magic button. It keeps your phone properly navigating across carrier networks, especially when roaming or changing communication standards. It's enough for the average user to know that it's automated, and you only have to intervene when there's a clear failure.
Use network resets as the primary tool for updating communication profiles. It's safe, efficient, and doesn't require a deep knowledge of the engineering menu. Remember, communication stability depends on a combination of factors: quality. SIM-Maps, operator coverage and the relevance of your device's software.