How to amplify the cellular signal on Xiaomi Redmi: from settings to homemade antennas

Have you noticed that your Xiaomi Redmi has become worse at catching the network? Call from home - the subscriber can not hear, the Internet is lost, then works at 2G speeds, and in some rooms there is no connection at all? The problem of weak signal is familiar to many owners of smartphones of this line - especially in densely populated areas or country houses. The reasons can lie both in software settings (for example, the wrong network mode) and in hardware constraints (weak communication module or interference from walls).

In this article, we will discuss 10 proven ways to amplify the 4G/5G signal on Xiaomi Redmi without buying expensive repeaters, from basic Android settings to creating a homemade antenna from improvised materials. All methods have been tested on Redmi Note 10/11/12, Redmi 9/10/13C and POCO X3/X4, but will also be suitable for other devices based on MIUI. Importantly, some solutions require root rights or unlock the bootloader - we will separately specify such cases and warn about the risks.

1. Check the basic network settings

Before you get into hardware or install third-party apps, make sure that the problem is not the wrong MIUI settings. Often users accidentally change network settings without even knowing it. For example, activated 3G Only automatically limits Internet speed and impairs communication stability.

Open the Settings menu → SIM- maps and mobile networks and check the following points:

• 📶 Network mode: Must be 4G/5G (recommended) or Auto. If only 2G/3G is selected, the smartphone will not connect to modern towers.
• 🔄 Automatic Network Selection: Turn on this option if manually specified operator that is not catching well in your area.
• 📡 Roaming: Turn it off if you’re on a home network — sometimes this feature interferes with a stable connection.

The regime is chosen 4G/5G (Automobile)|Automatic operator selection enabled|Roaming is disabled (if not necessary)|Checked out. APN-settings (see below)-->

If the signal hasn't improved after the changes, move on to the next step. Note that some MIUI firmware (especially global ones) may not have manual network selection, and Network Signal Guru (discussed below) will help.

2. Updating the firmware and modifying the radio module

Weak signal isn’t always the fault of hardware — often the problem lies in outdated software. Manufacturers regularly release updates that optimize modem performance. For example, in Redmi Note 10 Pro, after upgrading to MIUI 14, many users reported a 15-20% improvement in 5G reception.

To update the firmware:

1. Go to Settings → About the phone → System update.
2. Click Check Updates and wait for the latest version to download.
3. If there are no updates, check the firmware region: sometimes the global versions (Global ROM) lag behind the Chinese (China ROM) by 2-3 months.

If the update doesn't work, try flashing the radio module separately, which is a riskier method, but sometimes it works.

1. Download the current version of modem firmware for your model (see 4PDA or XDA Developers forums).
2. Fastboot commands fastboot flash modem NON-HLOS.bin

⚠️ Warning: Incorrect firmware of the radio module can lead to complete loss of communication or "bricking" of the phone. Do this only if you are confident in your actions and there is a backup EFS!

3 Optimization of APN- operator settings

Wrong. APN-Access Point Name is one of the most common causes of poor internet at a normal signal level. Even if the smartphone shows 2-3 “sticks”, the speed can be like in the dial-up of the 90s. Each operator (MTS, Beeline, Tele2, MegaFon) has its own parameters. APNAnd sometimes they get lost after updates or shifts. SIM-cards.

To set up the APN manually:

1. Go to Settings. → SIM-maps and mobile networks → [Yours. SIM] → Access points (APN).
2. Click Add APN and enter your operator’s options (see table below).
3. Save the settings and restart the phone.

If the Internet is not working after changing APN, check if the Mobile Traffic Limit option is activated in the SIM- card settings. Also, some operators (for example, Yota) require additional parameters, such as APN Type: default,supl or Protocol: IPv4/IPv6.

MTS|Beeline|MegaFon|Tele2.|Yota|Other-->

4. Signal amplification applications: what works and what doesn't

There are hundreds of apps on Google Play that promise to "boost signal 200% in 5 minutes," 90 percent of them are empty-handed, that only show beautiful graphics but don't affect the actual connection, but there are a few utilities that do help by optimizing the connection or forcing reconnection to the towers.

Effective applications:

• 📊 Network Signal Guru — shows detailed information about nearby towers (signal level, frequency, operator) and allows you to manually connect to the most powerful tower. Requires root for full functionality.
• 🔄 4G LTE Switch — forcefully switches the phone between 2G/3G/4G, which helps to "reset" the connection.
• 📡 NetMonster -- analyzes neighboring cells and suggests the best cell to connect to, but it works without root, but with limitations.

How to use Network Signal Guru to amplify your signal:

1. Install the application and grant location rights.
2. Open the Nearby Cells tab – all the towers available are displayed here.
3. Find the tower with the highest signal level (the RSRP should be closer to -80 dBm, not -110 dBm).
4. Press the Lock Band and select the frequency of that tower (e.g. Band 3 or Band 7).

⚠️ Warning: Forced band locking can impair communication if the tower is overloaded or too far away.

Useless applications (don’t waste time):

• 🚫 Signal Booster, Network Signal Speed Booster -- just showing ads.
• 🚫 Internet Booster – clears the cache but does not affect the signal.
• 🚫 Any program that requires premium amplification.

5. Hardware methods: from repeater to homemade antenna

If software doesn't work, it's time to move to hardware solutions, which require more effort, but often yield better results, especially in low-cost environments (country houses, basements, thick-walled offices).

Method 1: Repeater (repiter) of the signal

This device can catch a signal from the outside and relay it indoors, which is fine if you have a connection outside and you don't. Minus: good repeaters cost 5,000 ₽, and cheap Chinese models (Aliexpress) often cause interference.

Method 2: External antenna with magnetic fastening

4G LTE MIMO antennas (such as Poynting XPOL-1) are attached to a window or roof and connect to the phone via an adapter.

• 📡 An antenna with a SMA or TS-9 connector.
• 🔌 The USB-C adapter to SMA (for modern models) or Micro-USB to SMA (for older models).
• 📶 Network Cell Info app to check for improvements.

Method 3: Homemade antenna from a can or foil

If you don't want to spend money, you can make a directional antenna out of materials you can use, like a beer can antenna that amplifies the signal by 5 to 10 dB by focusing the waves.

1. Take an aluminum jar (0.5 liters), wash and dry.
2. Cut the bottom and top, unfold into a "plate".
3. Attach the can to the window with tape so that it is directed towards the nearest tower (find it on the map cartogis.ru).
4. Place the phone in the center of the plate (can be fixed on the stand).

💡

To find the direction to the tower, use the compass and data from the Network Signal Guru app. The optimal angle of the antenna is 30-45 degrees up.

The effectiveness of homemade antennas depends on the distance to the tower and the presence of obstacles. At best, you will get +1-2 "rods" of the signal, at worst, no effect.

6. Checking "iron": communication module and SIM- card

If none of these methods worked, the problem could be in the hardware of the phone, and it's often the fault of:

• 📱 A damaged communication module (e.g., after falling or falling moisture).
• 🪪 Worn SIM- card (microcracks on a chip or contact oxidation).
• 🔌 Bad antenna contact (the plume is leaving or the connectors are oxidized).

How to diagnose hardware problems:

1. SIM- card: insert it into another phone, if it's working properly, Redmi's the problem.
2. Check the communication module: enter the engineering code ##4636##, select Phone Information and see Set preferred network type. If the LTE only connection is lost, the module is defective.
3. Visual inspection: Take the phone apart (if you have experience) and check if the antenna plume is moving away from the motherboard. On the Redmi Note, it is usually located under the back cover, next to the camera.

⚠️ Note: If you are not sure about your disassembly skills, it is better to contact the service center. Damage to the antenna plume will lead to a complete loss of communication, and its replacement will cost 1,500–3,000 ₽.

The cost of repairing the communication module in Xiaomi Redmi:

7. Alternative solutions: Wi-Fi Calling and Mesh-networks

If cellular signal amplification is not possible (for example, you live in the outback), consider alternative ways of communicating:

• 📞 Wi-Fi Calling: calls and SMS over the Internet. Works on all Redmis with MIUI 12+ and is supported by MTS, Beeline, MegaFon. Included in Settings → SIM-Cards → Wi-Fi calls.
• 🌐 Mesh network: If you have multiple Xiaomi devices (like a Mi Router router and phone), set up a mesh network for stable coverage throughout your home.
• 📡 Satellite Internet: for country houses, Starlink (from 2,500 ₽/month) or Yandex Sputnik (in test mode) is suitable.

Wi-Fi Calling is the easiest solution, but it has limitations:

• ✅ Works even when there is no cellular connection (only Wi-Fi is needed).
• ❌ Not all operators support data transfers (calling only and SMS).
• ❌ When switching between Wi-Fi and cellular network, communication interruptions are possible.

💡

Wi-Fi Calling is the best option for buildings with thick walls (such as monolithic houses or basements) where there is no cellular signal, but there is stable Wi-Fi.

8.Extreme measures: modem firmware and phone replacement

If you've tried everything, but the signal is still weak, there are two radical solutions:

1. Firmware custom modem software

On the XDA Developers and 4PDA forums, there are modified modem firmware that promise 10-30% signal improvement. For example, there are patches for Redmi Note 10 Pro that optimize the work with Russian operators.

• ⚠️ Unlocked bootloader and root rights are required.
• ⚠️ The risk of “bricking” the phone with a firmware error.
• ⚠️ Xiaomi’s warranty will be lost.

2. Replace the phone with the best modem model

If your Redmi is older than 2020, it may be that its communication module is outdated. New models (like the Redmi Note 12 Pro+ or POCO F5) use Qualcomm X62 or Dimensity 1080 modems, which work better with 5G and support more frequencies.

• 📶 Support your operator’s ranges (e.g. Band 3, Band 7, Band 20 are important for MTS).
• 🔋 Presence of MIMO (multiple antenna technology to amplify the signal).
• 📊 Communication tests on GSMArena or DXOMARK (Network section).

Yes, I'm already choosing a new model | Yes, but only if the repair doesn't help | No, I'll look for other ways | I'm already doing well-->

FAQ: Frequent questions about signal amplification on Xiaomi Redmi