How many? SIM-maps to Xiaomi Mi 9T (Redmi K20)? Discussing a hybrid slot, Dual SIM and the nuances of 2026

Xiaomi Mi 9T (also known as the Redmi K20 In some regions, it remains one of the brand's most popular smartphones even years after its release, AMOLED-screen without a cutout and, of course, for flexible connectivity SIM-But that's where the questions start: how many maps? SIM-Does this model support cards? Can you use two at the same time? SIM How to insert a nano-SIM so that you don't break the tray? In this article, we'll look at all the nuances of working with the computer. SIM-map 9T, including hidden settings, operator compatibility and up-to-date 2026 life hacks.

If you are just planning a purchase or have already encountered problems (for example, the smartphone does not see the second one). SIM or 4G And you can see here, in one of the maps, step-by-step instructions, compatibility tables, and answers to common questions. 5G mi 9T (spoiler: not everything is so clear) and what to do if the slot for SIM-The cards are out of order. Let's start with the main thing, how many are you going to do? SIM-Cards can be installed in this machine?

How many? SIM-Cards supported by Xiaomi Mi 9T: record-keeping

According to the manufacturer’s specifications, Xiaomi Mi 9T It is equipped with a hybrid slot for two nano-SIM cards (Dual). SIM) or one nano-SIM + microSD cards (up to 256GB) which means that you can physically:

• 📱 Use two. SIM-Cards at the same time (Dual) SIM Dual Standby, DSDS).
• 💾 Set one up. SIM-map + MicroSD for Expanding Memory.
• ❌ It's impossible to use two. SIM-Cards and memory cards at the same time – you will have to choose.

It is important to understand that Mi 9T Supports Dual Technology SIM Dual Standby (DSDS), but not a dual SIM Dual Active (DSDA). Which means both of you SIM-The cards may be active in standby mode, but during a call on one of them the second will be inaccessible for calls (SMS Mobile Internet usually works).

The official characteristics confirm:

• 📶 Support 4G LTE both SIM-maps (but not at the same time - more on this below).
• 🔄 Possibility of hot replacement SIM-maps (no reloading required).
• ⚡ Maximum download speed: up to 600 Mbps (LTE Cat.12).

Hybrid Slot: How Does It Work and What Are the Limitations?

The main feature of Xiaomi Mi 9T — It is a hybrid slot that combines the functions of connecting the second SIM-So let's look at the maps and the memory cards:

🔧 Technical details:

• 📏 Slot sizes: standard nano-SIM (4FF) for SIM 1 and a combined slot SIM 2/microSD.
• 🔌 Slot Contacts: 8 Contacts for the Slot SIM + 9 MicroSD Contacts (Shared Pins).
• ⚠️ Attention: with frequent change of memory cards contacts can wear out faster.

If you choose a configuration with two SIM-by cards, note that 4G LTE Only one of them will be able to work on the one. SIM 1). Second second SIM will be limited 3G/2G, Even if the operator supports 4G. This is a hardware limitation - this is how the smartphone board is designed.

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To check which one SIM-The card is a priority for 4G, Go to Settings. → SIM-maps and mobile networks → Network priority.

How to insert it correctly SIM-map 9T: step-by-step

Incorrect installation SIM-The card may damage the contacts or tray. follow this instruction to avoid problems:

Turn off your smartphone (recommended, but not required)

Prepare a paper clip or tool to remove the tray

Check the size. SIM-maps (must be nano-SIM)

Clear the contacts. SIM-dust cards (soft cloth)-->

Step 1. Find a slot for SIM-cards on the top of the smartphone (near the power button).

Step 2. Put the paper clip into the tray hole and press it gently to move out.

Step 3. Place it. SIM-cardboard:

• 📱 SIM 1: top slot (nano-SIM only).
• 📱 SIM 2 or microSD: bottom slot (nano-SIM face up or microSD contacts down).

Step 4. Carefully insert the tray back before the click. Make sure it sits straight - skews can damage the contacts!

⚠️ Note: if after installation the smartphone does not see SIM-map, try it:

1. Reset the device.
2. Carefully remove and insert the tray again.
3. Check it out. SIM-The card on another phone (possibly damaged).

Dual setup SIM: How to manage maps and networks

After installation SIM-They need to be properly configured. 9T This is done through the Settings menu. → SIM-Maps and mobile networks. Let's look at the key options:

1. Priority of the network for each SIM:

• 📶 SIM 1: It is recommended to set 4G (preferably).
• 📶 SIM 2: If you need calls, select 3G or 2G (4G no-one will work).

2. Switching between SIM-map:

• 📞 For calls: when dialing, tap the icon SIM-card next to the call key.
• 📶 For mobile Internet: in the notification panel, hold the mobile data icon, then select the desired one. SIM.

3. Names. SIM-Cards: To avoid confusion, give them unique names (e.g., "Worker" and "Personal") in the settings.

🔹 Hidden function: If you have problems connecting to the network, try manually selecting the operator:

1. Go to Settings. → SIM-maps and mobile networks.
2. Choose. SIM-map → Choice of network.
3. Turn off Automatically and select the operator manually.

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If you're on second SIM-mapping 4G, It's not a malfunction, it's the way the smartphone is designed. SIM 2 is 3G.

Compatibility with operators and 5G: What you need to know in 2026

Despite the fact that Xiaomi Mi 9T It was released in 2019, and it still supports most of today's communication standards:

📡 Support 4G LTE:

• 🌍 Global frequencies: B1/3/5/7/8/20/28/38/40/41 (The full list depends on the regional version of the smartphone).
• 📶 Speed: up to 600 Mbps (download) and 150 Mbps (return).
• ⚠️ Note: some operators (e.g. T-Mobile) USA) frequency B71, which is not supported by Mi 9T. Before buying, check compatibility!

❌ Support 5G: Xiaomi Mi 9T doesn't support networks 5G — It's a hardware constraint. 5G, Consider newer models, such as Xiaomi. 11T Or the Redmi Note 12 Pro.+.

🔄 Roaming and eSIM:

• ✈️ Roaming: Both SIM-Cards support roaming, but rates may vary.
• 📱 eSIM: Mi 9T Does not support electronic SIM-map.

📊 Compatibility table with popular operators (2026):

Frequent problems with SIM-map 9T and their decisions

Even reliable smartphones fail. Here are the most common problems with the Internet. SIM-maps in Xiaomi Mi 9T and ways of eliminating them:

🔴 Problem 1: The smartphone can’t see SIM-map

• 🔹 Cause: Incorrect installation, damaged SIM malfunction.
• 🔧 Solution: Reboot the phone. Check. SIM-Update the firmware to the latest version (see section below).Reset network settings: Settings → System system → Resetting settings → Resetting Wi-Fi, Mobile Network and Bluetooth.

🟡 Problem 2: The mobile Internet is not working on one of the SIM

• 🔹 Reason: Incorrect settings APN limiting the operator.
• 🔧 Solution: Check the settings APN: Settings → SIM-maps and mobile networks → [choose SIM] → Access points (APN). Make sure that mobile data is included for the right SIM. Call the operator to activate the service.

🔴 Problem 3: Calls are interrupted or not passed

• 🔹 Reason: Conflict between SIM-map-signal.
• 🔧 Solution: Turn off second SIM Turn on Flight Mode for 30 seconds, then turn it off.

⚠️ Warning: if both of them have stopped working after falling or getting moisture SIM-The card is likely to have a damaged communications module, which requires a diagnostic at a service center, and self-repairing can make the problem worse!

Updating the firmware and its impact on the work SIM-map

Sometimes problems with SIM-These cards are caused by outdated software. Xiaomi regularly releases updates that fix communication errors:

🔄 Step-by-step instruction:

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

📌 Important nuances:

• 🔋 Make sure the battery is charged >50% to avoid crashes during the upgrade.
• 🌐 Use a stable Wi-Fi connection (updates weigh 1-3 GB).
• ⚠️ Note: If the network is missing after the update, reset the network settings (see previous section).

🔹 Useful tip: if you use custom firmware (for example, LineageOS), problems with the SIM-The cards may be associated with incorrect mods, in which case it is recommended to return to the official mode. MIUI.

📊 Latest versions MIUI for Mi 9T (2026):

• 🌍 Global version: MIUI 14 (Android 12).
• 🇨🇳 Chinese version: MIUI 14 (Android 13).
• 🇪🇺 European version (EEA): MIUI 14 (Android 12).

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Updating the firmware can solve problems with connecting to 4G, Especially if they occur after a change of operator or roaming.

FAQ: Answers to frequent questions about SIM-maps in Xiaomi Mi 9T