Mobile Internet on Xiaomi 9S: a complete guide to setup and troubleshooting

The Xiaomi 9S (also known as the Mi 9 SE) remains a popular choice among users due to the balanced characteristics and support of modern communication networks. However, even owners of this device sometimes face problems when connecting to the mobile Internet - whether it is the absence of a 4G/5G icon in the status bar, a “No Internet access” error or a sudden disconnection of data. In this article, we will discuss all possible ways to enable mobile Internet on the Xiaomi 9S, from basic settings to solving rare software failures.

It is important to understand that the reasons for the lack of Internet can lie in the settings of the phone itself, and in the parameters. SIM-We will look at each scenario separately so that you can quickly diagnose the problem and return access to the network. 9S or have problems after the update MIUI, This guide will help to restore the connection without contacting the service center.

1. Basic check before setting up mobile internet

Before you change your phone settings, make sure that the problem is not due to external factors.

• 📶 Network signal level: If there is no "stick" signal in the status bar or a cross is displayed, the problem may be in the operator's coverage area.
• 💳 Activation. SIM-maps: new SIM-The card requires activation (usually takes 15 minutes to several hours). USSD-command (e.g. *100# for MTS).
• 💰 Account balance and rate: no money in the account or an expired Internet packet is a common cause of disconnection *100*1# (Beeline or through the operator's application.
• 🔄 In-plane mode: accidentally turning on this mode blocks all wireless connections, and you can swipe down from the top of the screen (notification panel) to check its status).

If all external factors are fine, but mobile Internet on the Xiaomi 9S still doesn’t work, move on to the phone’s settings. Note: some carriers (such as Tele2 or virtual carriers like Tinkoff Mobile) may require manual APN input, which we’ll discuss in the next section.

2. enable mobile data transfer in MIUI settings

By default, mobile Internet on Xiaomi 9S is enabled via the notification panel or settings menu. If you have never changed these settings, follow the instructions:

1. Open the settings (cog icon on the desktop).
2. Go to section. SIM-Maps and mobile networks (or Mobile Network in older versions) MIUI).
3. Choose. SIM-The card you want to activate the Internet for (if there are two of them).
4. Activate Mobile Data slider (should turn blue).
5. Make sure that the Data Transfer option is enabled below (sometimes called Enable 4G/5G).

If the Internet has not worked after these actions, check if there are restrictions on background traffic:

• 📱 Same menu. SIM-maps and mobile networks typify at the item Data Use.
• 🔍 Make sure that for the current SIM-The card does not have a limit (the schedule of use should be green, not red).
• ⚙️ Enable the Background data option if it is disabled.

It's important! 9S two-way SIM-The default default Internet card is only one of them, so you can change the priority. SIM For data transfer, go to Settings → SIM-maps and mobile networks → Transfer data and select the desired card.

3. APN setting up for mobile internet

APNs (Access Point Name) are the "addresses" that connect the phone to the carrier's Internet, and if they're lost or not automatically configured, the mobile Internet won't work. Here's how to check and change them:

1. Open the Settings. → SIM-maps and mobile networks.
2. Choose. SIM-map, then tip on the access point (APN).
3. If there are several APNs on the list, select the one that matches your carrier (usually marked with a tick).If the list is empty, click Add.

Below are the correct APN settings for popular Russian operators (enter only the fields that are indicated):

After you enter the settings, be sure to save the APN (click on the three dots in the upper right corner and select Save), then restart the phone. If the Internet doesn't work after that, try manually selecting the saved APN in the list.

⚠️ Some virtual operators (e.g. Tinkoff Mobile or SberMobile) use the APN the main operator (MegaFon or Tele2). Check the current settings on your provider’s website – they may differ from the standard ones.

Selection of network type (4G/5G/3G) and mode of operation

The Xiaomi 9S supports 4G LTE networks, but in some regions it can automatically switch to 3G or 2G if the 4G signal is weak.

1. Open the Settings. → SIM-maps and mobile networks.
2. Choose. SIM-map, then type on the network type (or preferred network type).
3. Set the value of 4G (preferably) or LTE/3G/2G (auto).

If 5G is available in your area (such as Moscow or St. Petersburg) but the option is not displayed, it could mean:

• 📡 Yours. SIM-card does not support 5G (replacement USIM).
• 📱 In the firmware MIUI support off 5G For your model (relevant to custom firmware).
• 🔄 The operator does not provide 5G in your area (check the coverage on the provider's website).

On Xiaomi 9S with original firmware MIUI Global 5G is supported only on some modifications (for example, for the Chinese market). In Russian versions, this feature can be blocked software. If you are critically important to connect to 5G, consider installing custom firmware (for example, xiaomi.eu), but be aware of the risks of loss of warranty.

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If the Internet is gone after a network type change, return the settings to Auto mode and restart the phone. Sometimes forced choice of 4G can lead to conflicts with APN.

5. Remediation of software failures

If the mobile Internet on the Xiaomi 9S was working before, but suddenly stopped, the problem may lie in a software failure.

Resetting network settings

This procedure will return all network settings (Wi-Fi, mobile Internet, Bluetooth) to factory parameters, but will not affect personal data:

Settings → System → Resetting settings → Resetting network settings

After resetting, the phone will automatically restart, you will need to re-enter your Wi-Fi passwords and set up your APN (unless they boot automatically).

Cleaning up Google's cache services

Sometimes mobile internet crashes are linked to Google Play Services, to clear the cache:

1. Open Settings → Applications → Application Management.
2. Find Google Play Services (or Google Play Services).
3. Tap on the Warehouse, then click Clear cache.

Checking for MIUI updates

Older versions of firmware may have network connection bugs.

Settings → About the phone → System update

If you have an update, install it and restart the device. Importantly, make sure your phone is at least 50 percent charged before upgrading, and connect to Wi-Fi to avoid wasting mobile traffic.

⚠️ Attention, if after the update MIUI The mobile Internet is gone, and this may be due to a change in energy saving policy. → Battery and productivity → Manage application power consumption and disable restrictions for applications using the Internet (for example, browsers or instant messengers).

Hardware problems and diagnostics

If none of the software methods worked, the problem could be the hardware of the Xiaomi 9S. Here are the most common malfunctions:

• 📱 Slot damage SIM-If the phone doesn't see the card SIM-card or it periodically "disappears", perhaps oxidized contacts in the slot. Try to clean them carefully with a lasticle or alcohol.
• 📡 Antenna module malfunction: If the phone only catches the network in certain positions (for example, when holding it at an angle), this may indicate an antenna break.
• 🔋 Communications module problems: if you fall or get moisture, the chip that handles mobile communications may fail.

For self-diagnosis:

1. Try inserting. SIM-If the Internet works, the problem is Xiaomi. 9S.
2. Check if calls and SMS are working. If not, the malfunction is related to the communication module.
3. Run the hardware test through the engineering menu (enter ##4636## and select Phone Information). Under Set preferred network type, try manually specifying the network type.

If you suspect a hardware malfunction, but the phone is warranty, contact the official Xiaomi service center. Self-repair can lead to loss of warranty obligations.

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Before visiting the service center, back up your data via Mi Cloud or computer. In some cases, a complete phone reset may be required for diagnosis.

7. Alternative ways of connecting to the Internet

If the mobile Internet on Xiaomi 9S and did not work, but you urgently need access to the network, use alternative methods:

• 📶 Modem mode: connect your phone to another device (laptop or tablet) via USB Or you can use Wi-Fi to distribute the Internet from it. → Modem mode.
• 🔄 Shared Wi-Fi: If you have an open or familiar Wi-Fi network nearby, connect to it. Don't forget about security - avoid public networks without a password.
• 📱 Second second SIM-Card: if you have two-sim Xiaomi 9S, Try to activate the internet on the second SIM (if it is from another operator).

It can also be used temporarily. USSD-commands to check balance and activate packets:

• 💳 MTS: *111*59# (check-up).
• 💳 Beeline: *102# (service management).
• 💳 MegaFon: *105*00# (tariff).

FAQ: Frequent questions about mobile Internet on Xiaomi 9S