How to enable 3G on Xiaomi: A complete guide to setting up a network

Many users of Xiaomi, Redmi and Poco smartphones face a situation where the device stubbornly clings to slow E (EDGE) or, conversely, loses the signal in areas of unstable 4G coverage. In such cases, forced switching to 3G (WCDMA) becomes the only way to maintain a stable voice connection or provide some access to instant messengers. Modern shells MIUI and HyperOS often hide these settings, relying on automatic selection, but manual control of the radio module remains available.

The problem can also be incorrectly exposed access points or a software failure that prevents the phone from registering with a third-generation network. In this article, we will discuss in detail how to make your gadget work in 3G mode using both standard system tools and more advanced methods through the engineering menu.

Before you start the manipulation, make sure that your SIM-The card supports standards UMTS/HSPA, The data plan is active, and sometimes the carriers in certain locations prioritize the traffic. LTE, ignoring older protocols, so understanding how to manage network priority is a key skill for an Android device owner.

Checking basic settings SIM-map

Before you go into the depths of the system menu, you need to eliminate trivial configuration errors. Often users forget that there may be a card in the slot that does not support the system. 3G, Or you've been knocked down after you update your firmware. → SIM-maps and mobile networks.

It is important to check whether the "Use 3G" option is activated for the selected slot. In two-symbol Xiaomi devices, it often happens that 3G is allowed only for one card selected as the main one for data transfer. If the slider is turned off, the Internet will not work, regardless of the signal level.

⚠️ Attention: When switching over the operating mode SIM-The phone may lose the network for a short time and re-register at the operator's base stations.

Also worth paying attention to roaming data if you are overseas.Without the enabled data roaming option, the phone can block the connection to third-party 3G networks even if they are available. Make sure the right type of network is chosen for your main SIM, if that choice is provided by the interface.

• 📱 Check if it's inserted. SIM-card.
• 📡 Make sure that data transfer is enabled in the mobile network settings.
• 🔄 Try moving the SIM card to the second slot if the first one doesn't see it. 3G.

If the basic settings are fine but the internet is not working, it may be the choice of a specific communication standard that is problematic, with standard menus often offering a general choice of “prefer LTE” but not a hard 3G fix.

Using an engineering menu to select a network type

The most reliable way to force Xiaomi to turn on 3G is through a hidden engineering menu that allows you to interact directly with the device’s modem without the limitations of the graphics shell, and uses special code that runs on most MediaTek and Qualcomm processors.

Open the Phone app and dial the combination ##4636##. If the code is correct, the Check menu will open where you need to select Phone Information. In some versions of MIUI, this item may be called Phone Information 1 or Phone Information 2 depending on the slot.

In the list that opens, find the drop-down menu, Set Preferred Network Type, which can be “LTE/TD-SCDMA/CDMA EvDo/GSM/WCDMA” by default. You need to choose the option that contains WCDMA only or WCDMA preferred.

Choosing WCDMA only mode will completely disable the 4G and 2G reception, forcing the phone to look exclusively for third-generation towers, which is useful in areas where 4G signal is present, but it is very weak and unstable, which causes the phone to constantly jump between modes, consuming the battery.

Once you select the right setting, the network should reboot, you'll see a 3G or H+ icon in the status bar, and if the 4G icon is gone and 3G is available, then the manipulation was successful.

Configure APN Access Points for 3G

Even if the phone shows a 3G icon, the Internet may not work because of the wrong settings of the APN access points. These are the gateway addresses through which the device enters the global network. Operators usually send them automatically, but when you manually change the modes of the network, you sometimes need to re-register them.

The path to settings: Settings → SIM-maps and mobile networks → (Yours. SIM) → Access points (APN). In the lower right corner, click the “New Access Point” button or icon «+». You need to enter the data corresponding to your operator.

It is critical to fill in the Name and Access Point (APN) fields correctly. The remaining fields, such as proxies or ports, usually do not need to be filled in unless the operator provides specific instructions. After entering the data, be sure to click the menu (three dots) and select Save, and then activate the created point.

After saving the settings, it is recommended to turn on the flight mode for 10 seconds and turn it off so that modem re-registers on the network with new parameters. If the Internet does not appear, check whether the traffic restriction for background applications is worth it.

Resetting network settings as a method of solving problems

If manual settings don’t help, and the engineering menu returns standard values after a while, it’s worth resorting to a complete network reset, which will delete all stored Wi-Fi passwords, Bluetooth settings, and return the mobile network to factory settings.

To perform the reset, go to Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. The system will warn you of the consequences. Click Reset. The phone can reboot.

Once it's rebooted, the phone will start looking for networks again, at which point it has to automatically adjust the settings for your region and operator, often solving the problem of sticking to EDGE or not having a 3G signal.

This method is especially effective if you have recently changed. SIM-map 4G/5G, But the old configuration profile was in conflict with the new one. Reset clears the network configuration cache, allowing the system to build a connection from scratch.

3G problems in different regions and operators

It is worth considering that some carriers gradually turn off 3G networks (a process known as refarming), redirecting frequencies under 4G and 5G. In large cities, 3G coverage may be intentionally weakened or completely absent, so turning on 3G Only mode in the center of the metropolis will lead to a complete loss of communication ("No network").

At the same time, in remote rural areas, 3G is often the only stable standard. Here Xiaomi can behave strangely, trying to hold on to weak 4G instead of switching to confident 3G. In such cases, using an engineering menu to fix WCDMA is the only way out.

⚠️ Attention: Compulsory inclusion 3G in the area where the operator has already disabled this standard, will lead to the inability to make calls and send SMS. Return the settings to the "Auto" when leaving the coverage area 3G.

There's also a nuance with VoLTE. If your carrier supports voice calls over 4G (VoLTE), then switching to 3G may not be necessary for calls, but it's useful for saving charge if the data doesn't require high speed. However, if VoLTE isn't configured, then when you call, the phone will still fall into 3G or 2G.

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Use desktop widgets to quickly switch network modes if you move between areas of different coverage often, saving time to log into the deep settings menu.

Frequent Questions and Answers (FAQ)

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Main conclusion: For stable operation in areas of poor 4G coverage, use the engineering menu to fix the WCDMA mode, but be aware of the risk of communication loss when the operator disables 3G.

Xiaomi’s network mode management system provides a powerful tool for optimizing connectivity: Whether you need to force 3G for stability or troubleshoot connection drops, understanding these settings allows you to take full control of your device’s connectivity.