Why the A1 Mobile Internet is Not Working on Xiaomi Phone: A Complete Diagnostic and Fixing Guide

You are faced with a problem when mobile Internet from the operator A1 Has your Xiaomi smartphone suddenly stopped working? 4G/LTE In the status bar, the lack of access to sites with an active signal or the complete lack of connection — these symptoms are familiar to many users. SIM-map.

In this article, we will discuss all the possible reasons why mobile Internet is used. A1 It may not work on Xiaomi devices (including Redmi models, POCO We'll provide you with step-by-step instructions for how to fix them, from basic tests to deep diagnostics, you'll find a solution for even the most complex cases.

We pay special attention to the unique nuances of firmware MIUI, These are often the source of network problems, and we'll also be able to tell the difference between hardware failure and software failure.

1. Checking the basic settings: SIM-map and network mode

Before you dive into complex settings, make sure that the problem isn't in the basics. Start by checking your physical condition. SIM-maps and correctness of network mode selection.

Step 1: Reinstallation SIM-map

• 📱 Remove the tray for SIM-cards with a paper clip (on Xiaomi models) 12T Pro or Redmi Note 11 tray is on the left side).
• 🔄 Get it out carefully. SIM-Check the card for scratches or dirt, wipe the contacts with a dry wipe.
• 🔄 Put the card back in, make sure it fits tightly with the contacts. Try rebooting the phone.

Step 2: Checking the network mode

Xiaomi devices sometimes get their preferred network type settings confused to check:

1. Go to Settings. → SIM-maps and mobile networks.
2. Choose yours. SIM-map (A1).
3. Click Network Type and install 4G (preferably LTE/3G/2G (motor-car).

Step 3: Status check SIM-map

If the operator name is displayed next to the settings with the words No Service or Registration Error, this may indicate:

• 🚫 Lockdown SIM-Cards by operator (check balance or status via *100#).
• 📡 Network coverage problems (try inserting) SIM different phone).
• 🔧 Incompatibility with the VoLTE protocol (relevant for new Xiaomi models on the Internet) MIUI 14+).

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If the phone does not see after rebooting SIM-If you have a dual-SIM model, try inserting it into another slot, sometimes one of the slots can be damaged.

2. Configuring access points APN for A1 Xiaomi

Wrong parameters APN (Access Point Name is one of the most common reasons for the lack of mobile Internet. A1 (Velcom in Belarus uses unique settings that can be lost after updating the firmware or resetting the phone.

How to check and change your APN:

1. Go to Settings. → SIM-maps and mobile networks → A1 → Access points (APN).
2. If you have multiple profiles, select a1 (Or create a new one by clicking. +).
3. Fill in the fields according to the table below:

After saving the settings, restart your phone. If the Internet is not working, try manually selecting a profile. A1 Internet on the list APN.

Frequent errors in setting up APN:

• ❌ Misprints in the title APN (for example, internet.a1.be instead of.by).
• ❌ Installation of extra parameters (for example, MMSC or MCC/MNC — They're not needed for the Internet).
• ❌ Unsaved Changes (click Save After Editing!).

3. Firmware problems MIUI and resetting network settings

Firmware MIUI It's known for its surprises, especially after it's updated, and if the mobile Internet stopped working after it's updated, it could be the software:

Resetting network settings

This will remove all stored Wi-Fi networks and mobile internet settings, but often helps to reconnect:

1. Go to Settings → About the phone → Reset settings.
2. Select Network Reset (not to be confused with a full reset!).
3. Confirm the action and restart the phone.

Problems with VoLTE and VoWiFi

On new Xiaomi models (for example, Xiaomi 13 Lite or Xiaomi) POCO F5) Mobile Internet may not work due to conflict with voice communication technologies LTE (VoLTE. Try it:

• 📞 Turn off VoLTE in Settings → SIM-maps and mobile networks → A1 → Challenges by 4G.
• 🔄 Restart your phone and check the internet.
• 📡 If the Internet is working, the problem is in the operator's settings. A1 activate.

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After resetting network settings will have to re-enter passwords from Wi-Fi and configure APN. Preserve important data in advance!

Firmware update

If the problem occurs after the update MIUI, Check for new patches:

1. Go to Settings → About the phone → System update.
2. Click Check for updates and install available ones.
3. For stable firmware versions, use the official Xiaomi website.

Firmware rollback

If the Internet stopped working after the update, you can return the previous version. MIUI. For that:

1. Download the required firmware version with Xiaomi Firmware Updater.
2. Go to Settings. → The phone. → Updating the system → Threefold (⋮) → Select a firmware file.
3. Install the downloaded file and wait for the reboot.

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Before rolling back the firmware, back up the data through Settings → Additionally. → Backup and reset, which will keep you from losing photos and contacts.

4.Problems on the operator side A1

Sometimes it's not the phone that's the operator's fault. A1 It can be both global (disconnection) and local (locking your number).

How to check the status of services A1:

• 📞 Type *100# and select Balance Check. If the balance is negative, the Internet may be blocked.
• 🌐 Check the status of the network on the official website A1 (section “Technical works").
• 📱 Put it in. SIM-If the Internet doesn't work there, the problem is the operator's side.

Frequent problems with A1:

• 🔄 Automatic tariff extension: If there are not enough funds in the account, the Internet is disconnected until replenishment.
• 📵 Blocking for suspicious activity: For example, if you used your phone as a modem to distribute the Internet to multiple devices.
• 🔧 Incorrect linking of services: Sometimes after changing the tariff, mobile Internet is required to be re-activated.

If you suspect a block, contact support. A1:

• 📞 By phone: 123 (free of charge from the number) A1).
• 💬 In chat: through the official app My A1.
• 🏢 In the cabin: find the nearest office on the map.

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If the operator claims that everything is fine on their part, but the Internet does not work, demand written confirmation of the absence of problems.

5. Hardware problems: antenna, modem and SIM-tray

If the software methods didn't help, maybe the problem lies in the hardware. 9A or POCO M3) Sometimes suffer from poor antenna contact or modem malfunction.

Signs of hardware failure:

• 📶 There is no network signal (even calls are not working).
• 🔄 The phone "sees" the network, but the Internet does not connect under any settings.
• 📱 SIM-The card is not defined in any slot.

What you can do on your own:

1. Verification SIM-tray: Sometimes the tray contacts get dirty or bend. Clean them carefully with alcohol and check if the tray is not lufty.
2. Testing with another SIM-Insert the map SIM Another operator (e.g. MTS or life:) If the Internet works, your problem is yours. SIM-map A1.
3. Verification IMEI: Dial *#06#. If instead IMEI zeros or Invalid – the phone’s modem is faulty.

When to contact the service:

• 🛠️ If the signal has disappeared after falling or getting moisture.
• 🔧 If the phone doesn't see any of them SIM-map.
• 📡 If in Settings → The phone. → Status. SIM-Maps displayed Unknown or Error.

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Before visiting the service, make a reset to factory settings (Settings) → Additionally. → If the Internet doesn't work after that, it's just a hardware problem.

Alternative diagnostic methods

If the standard methods didn’t help, try these advanced methods:

Flight mode.

Sometimes it helps to "reset" the network stack:

1. Turn on flight mode for 30 seconds.
2. Turn it off and wait for the re-registration on the network.
3. Check the Internet.

Manual selection of the network

If the phone is stuck on the wrong tower:

1. Go to Settings. → SIM-maps and mobile networks → A1 → Choice of network.
2. Turn off automatically and select A1 manually.
3. If the list is empty, the antenna or SIM-map.

Test teams

For advanced users:

To check the signal:
#4636## → Phone information → Network statistics



To reset the modem settings (requires root):




su




echo "AT+CFUN=1,1" > /dev/ttyUSB2

Logs of the network

If you are looking for support from Xiaomi or A1, provide the logs:

1. Install the aLogcat application.
2. Start log entry, play the problem (try to connect to the Internet).
3. Save the log and send it to support.

7. frequent errors of Xiaomi users when setting up the Internet

Many problems arise from the wrong actions of users, and this is what you can not do when setting up mobile Internet on Xiaomi:

• ❌ Delete everything APN: Always leave at least one profile, otherwise the phone will not be able to connect to the network.
• ❌ Change. IMEI: Not only will it not help, it can also block your phone.
• ❌ Disable "Mobile Data" in the battery settings: C Settings → Battery → Optimization should not be a limitation for system applications.
• ❌ Use it. VPN unnecessarily: Some VPN block operator traffic.

Typical myths:

• 🚫 "Xiaomi is bad at catching the network: the problem is not in the brand, but in the settings or antenna of a particular model.
• 🚫 "You need to flash the phone under another region: This violates the warranty and often worsens the connection.
• 🚫 "Operator always to blame: 60% of the time the problem is solved by settings of the phone.

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If you tried all the methods in the article, but the Internet never worked — most likely, the problem is in the hardware of the phone or locking on the part of the operator.

FAQ: Frequent questions about mobile internet A1 Xiaomi