How to enable 4G on Xiaomi Redmi 9A: detailed instructions with APN settings and problem solving

Why Xiaomi Redmi 9A may not work 4G and how to fix it

Xiaomi Redmi 9A supports 4G LTE networks, but sometimes users find that the device only works hard in 3G or 2G mode, despite the availability of coverage. The reasons can vary from incorrect settings to hardware limitations of the operator. In this article, we will analyze all the ways to force 4G on, adjust network settings and fix typical problems.

It is important to understand that the Redmi 9A (model M2006C3LG for the global market) is equipped with a module LTE Cat.4, which theoretically should provide speeds up to 150 Mbps. However, in practice, the speed depends on the support of the frequencies by your operator. For example, in Russia, the smartphone is optimized to work with Band 3 (1800 MHz), Band 7 (2600 MHz) and Band 20 (800 MHz) – the main ranges of MTS, Beeline, MegaFon and Tele2.

If your Redmi 9A is stuck on 3G, don't be quick to blame the hardware. 80 percent of the time, the problem is solved software--just change the network mode, update the APN settings, or reset the mobile settings. Next, we'll look at all the methods in order, from the simplest to the most advanced.

Method 1: Enabling 4G through network settings

The most obvious way is to force you to select 4G (LTE) mode from the settings menu.

1. Open the Settings app (the gear icon on the home screen).
2. Go to section. SIM-maps and mobile networks.
3. Choose yours. SIM-card (if two of them).
4. Tap on the network type (or preferred network type).
5. Set the 4G (recommended) or LTE value.

If there is no 4G option on the list, it could mean:

• 📵 Yours. SIM-card does not support LTE (like the old one. USIM operator).
• 📡 There's no coverage in your area. 4G (Check on the operator's website).
• 🔄 On the smartphone installed firmware without support LTE for your region.

Make sure that SIM-card 4G (It should have been written LTE or 4G)

Check the balance and activity of the Internet package

Reboot your smartphone before changing your settings

Make sure you are in 4G coverage (check on the carrier map)

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It matters if, after the choice 4G The network disappears completely, return the setting to the car (3G/4G) — Maybe in your location. LTE-signal is too weak for stable operation.

Method 2: Set up an APN to work 4G correctly

The wrong APN (Access Point Name) settings are one of the most common reasons why Redmi 9A doesn't catch 4G. Even if LTE is available, without the right APN, the Internet won't work. Here's how to set up APNs manually:

1. Open the Settings. → SIM-maps and mobile networks.
2. Choose yours. SIM-Map and tap Access Points (APN).
3. Click on the three dots in the top right corner and select the New Access Point.
4. Fill in the fields according to your operator’s parameters (see the table below).
5. Save the settings and restart the smartphone.

If the 4G APN never worked after you set up, try the following:

• 🔄 Delete all the saved ones. APN And create a new one from scratch.
• 📞 Call the operator and request automatic sending of settings (usually arrives). SMS configurationally).
• 🛠️ Reset network settings to factory (Settings) → System system → Reset → Resetting network settings).

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If all saved access points are lost after resetting the APN, do not panic – the operator must automatically send the correct settings via SMS within 5-10 minutes.

Method 3: Update firmware to fix 4G issues

Sometimes the reason for the lack of 4G is the firmware bugs, Xiaomi regularly releases updates to fix the problems with the modem, to check the relevance of the software:

1. Go to Settings → About the phone → System update.
2. Click Check for updates.
3. If an update is available, download and install it.

Critical information: At the time of writing (2026), the latest stable firmware for Redmi 9A is MIUI 14 based on Android 12. If your version is lower (e.g. MIUI 12.5), be sure to upgrade - older versions had issues switching between 3G and 4G.

If the update doesn't work, you can try manual firmware via Fastboot or Recovery, but it's a risky method - if you make a mistake, your smartphone can turn into a brick.

• 🔴 After the update, the network signal disappeared.
• 🔴 The smartphone is constantly rebooting.
• 🔴 In the settings disappeared the item Network type.

Method 4: Verification of compatibility SIM-card-slots

Redmi 9A two-way SIM-cards, but only one slot works in the mode 4G. If you use two of them SIM-maps, make sure that:

• 📱 Basic SIM (s 4G) slotted 1 (It's usually marked as SIM 1 / 4G tray).
• 🔄 The settings have been chosen correctly SIM for mobile data (Settings) → SIM-map → Mobile data).
• 🚫 Second second SIM block out 4G (Some operators restrict the LTE second-card).

Also check if Flight Mode or Traffic Saving is activated:

1. Open the Notification Panel (swipe down from the top edge of the screen).
2. Make sure the Flight Mode icon is not active.
3. Go to Settings → Battery → Power Saving Mode and turn off restrictions for mobile data.

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In Redmi 9A, slot 2 (SIM 2) only supports 2G/3G. For 4G, always use slot 1!

Method 5: Reset network settings and factory settings

If none of these methods work, you have to reset your network or completely reset it to factory, which is a radical measure, but they often help with software failures.

Resetting network settings:

1. Open Settings → System → Reset.
2. Select Network Resetting.
3. Confirm the action (you will need to enter a password or pattern lock).

Full reset (Hard Reset):

⚠️ Attention! This method will delete all data from the phone, including photos, contacts and apps. → System system → Backup.

1. Go to Settings → System → Reset → Delete all data.
2. Select Reset your phone settings.
3. Wait for the process to be completed (it will take 5-10 minutes).

After discharge:

• 🔧 Set up your smartphone as a new one.
• 📶 Put it in. SIM-map and check availability 4G.
• 🔄 If the problem persists, contact the service center - the modem may be defective.

Additional Advice and Frequent Mistakes

Here are some of the reasons why 4G might not work on the Redmi 9A:

• 🔋 Battery savings: The battery settings may include a limitation on mobile data. disable it in Settings → Battery → Energy saving regime → Background restrictions.
• 📡 Roaming: In roaming, some operators automatically switch to 3G. Turn off data roaming in settings SIM-map.
• 🛡️ VPN or firewall: Apps like AdGuard or 1.1.1.1 can block the connection. Try turning them off.
• 📦 Security updates: Sometimes Google Play Services updates knock down network settings. check their relevance in Settings → Annexes → Google Play Services.

If you use custom firmware (like LineageOS or Pixel Experience), the problem may be incorrect porting of modem files.

1. Make sure the firmware supports your model (M2006C3LG).
2. Check if you have installed radio firmware for your area.
3. Contact the 4PDA or XDA Developers forum for a modem patch.

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If you often lose your network 4G in the subway or elevators, turn on the settings SIM-Cards option Switch to switch to 2G/3G If you have a weak signal, it'll help you avoid a communication breakdown.

FAQ: Answers to Frequent 4G Questions on Redmi 9A