How many? SIM-The cards are supported by Xiaomi Redmi 9: hybrid slot, 4G and installation secrets

Xiaomi Redmi 9 remains one of the most popular budget devices even years after its release, and is bought for reliability, performance and flexibility – especially when it comes to support. SIM-But here's a surprise for many users: the official specs and the actual capabilities of the device do not always match expectations. SIM-While the cards and the memory card are both simultaneously, others are faced with the choice between a second SIM and a memory extension. SIM-Maps can be installed in Redmi 9, how the hybrid slot works, and what pitfalls this configuration hides.

It’s important to understand that Redmi 9 came in multiple versions (including regional versions) and their capabilities may vary, and we’ll analyze the most common global version of the M2003J15SS, and also point out the nuances for other options, and if you’re planning to buy this smartphone or are already experiencing problems with installing the SIM, this information will help you avoid errors and make the most of the device.

Official Features: What Does Xiaomi Say?

According to the manufacturer, Xiaomi Redmi 9 is equipped with a hybrid slot for SIM-card that supports:

• 📱 Two nano-SIM cards (4G + 4G) or
• 💾 One nano-SIM. + microSD memory card (up to 512 GB).

This means that two people are used simultaneously. SIM-cards and memory card is impossible - you will have to choose between the second SIM and the expansion of the built-in 64/128 GB of memory: This is typical of budget smartphones, where manufacturers save on the number of physical slots.

However, there is an important caveat in the documentation: Dual support. 4G VoLTE (voice calls on the Internet) 4G) It only works if both of them SIM-The operator's cards support this technology, for example, in Russia, this feature is provided by Beeline, MegaFon and Tele2, but MTS may have restrictions depending on the tariff. SIM-The card will only work in the mode 3G or 2G, Even if the smartphone is connected to 4G-network.

Hybrid slots: how it works and why it matters

The hybrid slot in Redmi 9 is a combined slot that can accept either a second slot. SIM-It's a card, it's a memory card, it's not both, it looks like a normal nano-SIM tray, but it has an extra microSD connector:

• 🔄 If you put two in. SIM-The microSD slot will be blocked.
• 📁 If you choose one SIM + microSD, second SIM-The card won't be recognized.
• ⚠️ When changing configuration (for example, when removing a memory card to install a second one) SIM) The smartphone will require a reboot to recognize changes.

It is important to note that the tray for SIM-The maps in Redmi 9 are asymmetrical, meaning that you can only insert the cards in a certain position. If you're wrong, the smartphone won't see them. SIM-If you try to install it again, you can damage your contacts. To avoid problems, look for a small, beveled corner on the nano-SIM that matches the same corner on the tray.

Support 4G both SIM-maps: myth or reality?

One of the key advantages of Redmi 9 is the support of Dual. 4G, This means that you can work simultaneously on fourth generation networks on both SIM-But in practice, it doesn't always work as smoothly as you'd like:

1. Technical support: MediaTek Helio chipset G80, The Redmi 9 is actually compatible with Dual. 4G. This means that the hardware smartphone is able to work with two 4G-networking.
2. Operator restrictions: Even if the smartphone supports Dual 4G, Your mobile operator may artificially restrict this feature, for example, some tariffs allow you to use the same system. 4G only SIM-The map, and the second one works in 3G.
3. VoLTE as a prerequisite: To run two SIMs in 4G simultaneously, both must support VoLTE (4G voice calls). If at least one SIM does not support VoLTE, it will automatically switch to 3G for calls.

To check if Dual 4G works on your Redmi 9, follow these steps:

1. Go to Settings. → SIM-maps and mobile networks.
2. Choose each one. SIM-map separately and check if the network type is available: 4G (VoLTE).
3. If only 3G/2G is available for one of the SIMs, then your carrier or tariff does not support Dual 4G.

💡

If your carrier doesn’t support VoLTE, but you want to use 4G on both SIMs, try activating the option “4G+” or “LTE Advanced” in the network settings. Sometimes this allows you to bypass the restrictions, but calls will go through 3G.

Redmi: Who supports 2 SIM + microSD?

If you are critically interested in using two SIM-The Redmi 9 is not a good fit for both cards and a memory card at the same time, its hybrid slot does not allow this. However, in the Xiaomi lineup there are models with a dedicated microSD slot where such a configuration is possible:

As you can see from the table, only Redmi. 9A/9C among budget models offer a dedicated slot for microSD, which allows you to use two SIM-If this functionality is critical to you, consider these models instead of Redmi. 9.

⚠️ Note: Some sellers in the product description indicate that Redmi 9 supports "2". SIM + microSD. That's not true -- it's a hybrid slot, where you have to choose between the other slot. SIM Always check the configuration of the slots before buying!

How to properly install SIM-Maps in Redmi 9: step-by-step instructions

Incorrect installation SIM-Maps are one of the most common reasons why your smartphone doesn't recognize your network:

Turn off your smartphone (required!)|Find a tray for SIM (right-handed)|Prepare a paper clip or tool to remove the tray|Check that SIM-The cards are trimmed to nano-SIM format-->

We shall now proceed to the installation:

1. Remove the tray: Insert the paperclip into a small hole on the tray (on the right side of the smartphone) and press gently until the tray is pushed out.
2. Place it. SIM-map: 📱 Slot 1 (top): Basic nano-SIM (recommended for 4G). 📱 Slot 2 (bottom): second nano-SIM or microSD (but not both at the same time!).

Make sure you're in the correct position

Put the tray back in.

Turn on your smartphone.

If, after installation, one of the SIM-maps not defined:

• 🔄 Reboot your smartphone.
• 🛠️ Check if it is inserted correctly SIM (Sometimes it sticks and doesn’t touch your contacts).
• 📶 Try inserting. SIM in another slot (possibly damaged contact in one of the connectors).
• 📞 Make sure that SIM-The card is activated by the operator (sometimes new). SIM Registration is required on the network).

💡

If the smartphone does not see any of the SIM-The problem may be a damaged slot or antenna module, which requires a diagnosis at the service center.

Frequent problems with SIM-Redmi 9 maps and their solutions

Redmi 9 users often face typical work-related issues SIM-Let's look at the most common cases and how to eliminate them:

1.The smartphone doesn't see one of the SIM-map

Possible causes:

• 🚫 SIM-The card is inserted incorrectly or not to the end.
• 🔌 Slot contacts are damaged (often after falls or moisture hits).
• 📡 Problems on the operator side (for example, technical work).
• ⚙️ Failure in network settings.

Decisions:

1. Remove and re-insert. SIM-map.
2. Check if the SIM is working on another phone.
3. Go to Settings. → SIM-maps and mobile networks → [choose SIM] → Network type and install 4G (recommended).
4. Reset network settings: Settings → System → Reset → Network settings reset.

2. no internet on one of the SIMs (4G does not work)

If the smartphone is connected to 4G-Internet, but there is no Internet:

• 📶 Make sure you have enough money in your account and activate your internet package.
• 🔄 Switch the network type from 4G on 3G back and forth.
• 📱 Check it out. APN-settings: Settings → SIM-maps and mobile networks → [choose SIM] → Access points (APN). If the list is empty, ask the operator for settings.
• 🔄 Reboot your smartphone in flight mode for 30 seconds, then turn it off.

3. Calls are interrupted or poor communication quality

If the communication is lost or the voice is interrupted:

• 📞 Check if your carrier supports VoLTE.If not, calls will go through 3G, which may impair the quality.
• 📶 Try to turn it off. 4G this SIM: Settings → SIM-map → Type of network → 3G.
• 🔊 Make sure there are no physical obstacles (such as metal cases or covers blocking the signal).

⚠️ Warning: If after falling or getting moisture, the smartphone stopped seeing SIM-Do not try to disassemble the card yourself, this can lead to a short circuit.

FAQ: Answers to popular questions about SIM-maps 9