Which slot to insert SIM-map 4G-Xiaomi Redmi Internet: A Complete Guide

You just bought a Xiaomi Redmi and want to connect mobile Internet, but do not know which slot to insert into SIM-map 4G? Or you have a problem that the network only works in the 2G, despite the support LTE? This article will help you understand all the nuances - from choosing the right slot to setting the priority of networks.

Redmi models (especially budget series like Redmi 9A, Redmi Note 10 or POCO M3) often have hybrid trays where one slot is combined with a memory card connector. And in some devices (for example, Redmi 12) both slots support 4G, but only one can work in this mode at the same time, we will analyze all the options in detail so that you do not waste time rearranging the cards by pumping.

In the article you will find:

• 🔍 Slot layouts for popular Redmi models (2018–2026.).
• 📶 How to check which slot is active for 4G phone-setting.
• ⚠️ Frequent errors that cause the Internet to fail even when installed correctly SIM.
• 🔧 The priority of networks and APN maximum speed.

1.Slot types in Xiaomi Redmi: hybrid vs. double

Before you put it in. SIM-You need to determine what type of tray is used in your model. Xiaomi Redmi has two main options:

• 📱 Double slot (Dual slot) SIM): Two independent nano-SIM connectors, both of which can operate in mode. 4G, But at the same time, only one slot supports LTE (second-hand 2G/3G). Examples: Redmi Note 11 Pro, Redmi K50.
• 🔄 Hybrid slot (Hybrid) SIM): One for nano-SIM, the second for the second SIM Or microSD cards. Examples: Redmi. 9C, Redmi 8A, POCO X3 NFC.

To find out the type of slot of your model, check:

1. The official page of the device on the Xiaomi website (section "Specifications" → "SIM Card").
2. Inscriptions on the tray itself: If there is a microSD icon, it is a hybrid slot.
3. Settings menu: Settings → About phone → General information → SIM-card status.

In hybrid slots, the memory card and the second SIM don't work at the same time, and if you want both the Internet and the extra storage, you have to choose. In dual slots, there's no problem, but there's a limit to 4G running simultaneously.

In which slot to insert SIM for 4G: the rule "Slot 1"

In 90% of Xiaomi Redmi models, the main 4G slot is the Slot 1 (aka SIM 1).This is due to the hardware architecture: the first slot is connected to the main modem that supports all LTE bands. The second slot (SIM 2) often runs in 2G/3G mode or has limited 4G support (for example, only the 1800/2600 MHz bands).

Exceptions:

• 🌍 Redmi for the global market (marked Global): both slots can support 4G, but only one active.
• 🇨🇳 Chinese versions (without Google services): sometimes Slot 2 doesn't work with the Internet 4G altogether.
• 📡 Redmi 5G-Models (e.g. Redmi Note) 11T 5G): both slots support 5G/4G, But Slot is the priority. 1.

If you are not sure which slot you have active, follow the following steps:

1.Insert SIM into Slot 1 and check speed in Speedtest

2.Reboot your phone and repeat the test for Slot 2

3. Compare the results: where the speed is higher, that slot is the priority.

4. Check the settings in Settings → SIM-maps and mobile networks-->

3.How to set up 4G on Xiaomi Redmi: step-by-step instructions

Even if SIM-The card is inserted into the correct slot, the Internet may not work due to incorrect settings:

1. Activate Mobile Data: Go to Settings → SIM-maps and mobile networks → [Yours. SIM] → If the option is inactive, check the balance or status of the service with the operator.
2. Select Network Type: In the same menu, click Network Type and install 4G (preferably LTE. If only available 3G/2G, problem SIM-map (obsolete) USIM) or operator settings.
3. Set up an access point APN: Go to Settings. → SIM-maps and mobile networks → [Yours. SIM] → Access points (APN). If the list is empty, click Add and enter your operator's settings. For MTS, Beeline, MegaFon and Tele2, the current settings can be found on their official websites.

Example of APN for MegaFon (2026):

Name: Megafon


APN: internet




Proxy: Not specified




Port: Not specified




Username: gdata




Password: gdata




Type of authentication: PAP or CHAP




Type APN: default,supl

After saving the settings, restart the phone – this is a must for the application of changes.

💡

If you don't have Internet after setting up your APN, try manually specifying the APN type as default,supl,mms (even if you don't need MMS).

4. Frequent problems and solutions

If after all the manipulations 4G does not work, check these points:

• 📵 There is no network at all: make sure SIM-The card is activated (call from another phone to her number) if the phone can't see SIM, Try: wipe the contacts of the card with a brush (cleaning from oxidation). Insert SIM Update Xiaomi firmware (sometimes modem bugs are fixed in new versions) MIUI).
• 🐢 The Internet is working, but slowly (Edge/3G instead 4G): The reasons may be different: Read more about the slow Internet 1. Operator restriction: some tariffs (e.g., "For tablet" or "MTS Smart") artificially limit the speed on smartphones. 2. Tower congestion: In densely populated areas, operators can prioritize traffic, reducing speed for some devices. Try reconnecting manually: Settings → SIM-map → Choice of network → Manual connection. 3. Problems with IMEI: If the phone is recovered after resetting or firmware, IMEI You could have dropped it *#06#. If zeros are displayed, repairs are required.

⚠️ Note: If you use the Chinese version of Redmi (for example, purchased on AliExpress), it may not support ranges. 4G Check the compatibility on the FrequencyCheck website.

5.How to check which slot is active for 4G

If you are not sure which slot is used for LTE, follow the following steps:

1. Open the Settings. → SIM-maps and mobile networks.
2. Click on your name. SIM-maps (e.g. MTS 1).
3. Check Network Type: If LTE or 4G is specified, this slot is active.
4. For Double Slots: Go to Settings → Mobile network → Preferred type of network for SIM-maps and see which slot is marked as 4G.

Some firmware (e.g. MIUI 13/14) has the option to Use 4G for a slot where you can manually select a slot, and if you don’t have one, then 4G is tied to Slot 1 at the hardware level.

💡

On models with MediaTek (e.g. Redmi 9A), the 4G slot is rigidly assigned to the Slot 1. On Snapdragon (e.g., Redmi Note 10 Pro), you can sometimes reassign priority in settings.

6. Hybrid slot: how to combine 4G and memory card

If you have a hybrid slot (like the Redmi 9C or POCO M3) and you want to use both the second SIM and the microSD, there are two options:

• 🔄 Buying an adapter: There are dual adapters (e.g, SIM + microSD in one slot), but they often cause card recognition problems.Risk: The phone may not see one of the cards SIM or SD-map.
• ☁️ Cloud Storage: If you need a memory card for photo/video only, consider Google Photos (up to 15GB free) or Mi Cloud (part of Xiaomi’s ecosystem).
• 📱 USB-OTG + flash drive: With an adapter USB-C/OTG You can plug in an external flash drive.

If you do decide to use an adapter, choose models with a Rohs chip and verified reviews. Before buying, make sure that your Redmi model supports this configuration - some phones block non-original adapters at the firmware level.

7. Features for different operators

Not all operators work the same way with Xiaomi Redmi.

If you use a virtual carrier (e.g. Tinkoff Mobile, Yota), make sure your Redmi model supports their ranges.For example, Yota only operates at 2600 MHz (Band 7), which may not be caught in some Redmis for the Chinese market.

8. Alternative ways to connect to the Internet

If Xiaomi Redmi’s 4G is not configured, consider these options:

• 📡 Mobile Wi-Fi router: Devices like Xiaomi Mi Router 4G or TP-Link M7350 They allow you to distribute the Internet to multiple gadgets, plus: more stable than the Internet. SIM Minus: You need to carry an extra device with you.
• 🔗 Modem mode: If you have a second phone running 4G, Turn on the Access Point and connect Redmi over Wi-Fi. MIUI This is done through settings. → Access Point and modem → Modem mode.
• 🏠 Home Wi-Fi with repeat: If you are often in the same place (for example, at work), set up a Wi-Fi repeater (for example, Xiaomi Wi-Fi Repeater 2.

⚠️ Note: When using modem modem on Xiaomi Redmi, monitor the temperature of the phone, POCO X3) strongly warmed with prolonged Wi-Fi distribution, which can lead to trottling (automatic speed reduction).

FAQ: Frequent questions