The modern smartphone Xiaomi Redmi Note 7 provides users with ample opportunities for communication, and one of the key features is the support of two active devices. SIM-This option is especially relevant for those who share personal and work contacts or are looking to save on tariffs of different telecom operators. However, the physical installation of communication modules in the compact housing of the device requires compliance with a certain sequence of actions and accuracy, so as not to damage fragile structural elements.
The process of installing memory cards and sim modules in Redmi Note 7 has its own technical features related to the design of the tray combined type. Incorrect location of chips or careless handling of the extractor can lead to mechanical damage to the slot or errors in the definition of the network. In this guide, we will discuss in detail each step of the procedure, from finding the necessary tools to the final software setting of call priorities and mobile Internet.
Before you start manipulating the hardware, you need to make sure you have a good lighting workplace, which will allow you to clearly see the contacts on the maps and not confuse orientation when stacking in the tray, and it is worth noting that all actions are performed on the device turned off to avoid software failures in the definition of equipment by the MIUI system.
Preparation of the workplace and necessary tools
The first step in the installation process will be to prepare the toolkit. The Xiaomi Redmi Note 7 comes with a special metal key to extract the tray, which is usually in the box with the smartphone itself. If the original tool is lost, it can be replaced with a thin paper clip, having straightened one of its ends, or a special pint for electronics. The main requirement for the tool is sufficient rigidity and a thin profile so that it freely enters the opening of the mechanism.
It is also important to prepare yourself. SIM-Today, the de facto standard is the Nano-SIM format, which is the Redmi Note 7. If your cards are larger (Micro or Mini), they should be replaced by a carrier or gently trimmed according to a template, although the latter option is not recommended due to the risk of damaging the chip.
Organize the workspace so that the small parts are not lost. The smartphone tray is very small and easy to drop or lose in the carpet pile. It is recommended to use soft cloth or a special antistatic mat on which the extracted components will lie, and this will also protect the phone body from micro scratches during operation.
- 🔧 Special extractor key or straightened clip for access to the slot.
- 💳 Two active SIM-Nano-SIM maps with cut corners.
- 🧹 Soft lilac-free fabric for body protection and contact cleaning.
- 💡 Bright directional light source for visual inspection of installation.
Once all the components are ready, you can move to direct interaction with the device body. Take your time to use force, as the mechanical elements of the smartphone are designed with minimal gaps and require precise exposure.
Removal of the tray for SIM-memory-card
On the bottom end of the Xiaomi Redmi Note 7 case, to the right of the USB Type-C charging connector, there is a small circular hole. This is where you need to insert the extraction tool. Note that there is a microphone nearby, so it is important not to confuse the holes and damage the microphone grid with the sharp end of the clip.
Insert the key perpendicular to the surface of the case into the hole to the end. You should feel a slight click or resistance, after which the tray will slightly push out. You do not need to press too hard; if the tray does not come out, try to change the angle of the tool slightly or press a little more confidently, but without jerking. The spring-type mechanism will work automatically.
⚠️ Warning: It is strictly forbidden to insert the tool into the hole at an acute angle or swing it from side to side.This can lead to jamming of the mechanism or damage to the internal plumes, which will require expensive repairs in the service center.
When the tray appears from the case, gently tuck it in with a nail or tweezers and fully remove.In Redmi Note 7 a combined tray is used, one side of which is designed for a microSD memory card, and the other has two sockets for SIM-squat SIM And one for the second memory card, depending on the regional version. 1 (SIM), slot 2 (SIM/microSD).
Carefully examine the extracted tray. It usually has a schematic image showing the correct orientation of the cards. Do not confuse the sides, as inserting the card with contacts down or up into the wrong slot can lead to a lack of communication or short circuit.
Proper installation SIM-card-tray
The process of laying cards requires attention to detail. The Redmi Note 7 tray is designed so that the cards are fixed by exact matching of sizes and a rounded angle. SIM-The gold contacts must be directed downwards to the inside of the tray.
The second card is placed in the next slot, keeping the same orientation. If you plan to use a microSD card, it is installed in a special compartment, often located on the back of the tray or in a separate sector, depending on the design on the specific tray. Make sure that the card lies flat and does not protrude beyond the edge of the tray, otherwise, when the case is closed, the chip may be damaged.
☑️ Pre-installing check
Pay special attention to the rounded corner of the card. It serves as a key to prevent improper installation. If you try to insert a card and it does not fall into a recess, do not press. Turn it over or turn it 180 degrees. Forced insertion can break the plastic guide tray.
Once all the modules are placed, visually check their position again. The cards should sit tight, without skewing. If the tray is double-sided, make sure you don't mix up the front and back sides when you build.
- 📱 Put it in. SIM-maps with contacts down, orienting to a rounded corner.
- 🔒 Make sure the cards fit tightly to the bottom of the tray and don't protrude.
- 💾 When using microSD, check if it is blocking contacts. SIM.
- 👀 Conduct a final visual inspection before inserting into your phone.
Inserting the tray back into the smartphone case
Getting the tray back into the body is a crucial moment that requires proper orientation. The Xiaomi Redmi Note 7 tray is only symmetrical on one side, so it's important not to flip it upside down. Usually, the bevelled side of the tray or the side with the slot to be extracted must match the shape of the hole in the body.
Carefully insert the tray into the hole. It should enter smoothly, without resistance. If you feel a push, don't push. Take out the tray, turn it 180 degrees and try again. A properly oriented tray will enter the body almost completely, leaving only a small gap for the final press.
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If the tray is not easily inserted, do not use force at all. Turn it over with the other side - the design provides only one correct position for entry.
For final fixation, just press the tray edge with your finger until you click it, and the tray surface should be level with the smartphone frame. If the tray protrudes, this can disrupt the sealability of the case (although this model does not have full moisture protection) and cause dust to enter the interior.
After installation, turn on the device. MIUI automatically detect new SIM-maps and run the original setup wizard if the phone is turned on for the first time, or simply display network icons in the status bar.
Set up network priorities and parameters in MIUI
After the physical installation, you need to programmatically configure the operation of two SIM cards. MIUI This is the settings menu. Go to the settings path. → SIM-Maps and mobile networks. Here you will see a list of installed cards with their names (usually"SIM 1" and"SIM 2" or the names of operators).
In this section, you can set the default card for different types of traffic, which is critical to cost savings, because voice and mobile Internet rates can vary significantly, and you can choose one card for calling and the other card for data only.
Network name settings are also available, and it is recommended that you rename slots like "Worker" and "Personal" to avoid confusion when choosing a card for an outgoing call, making it easier to manage communications in your daily life.
Be sure to check your roaming settings if you are planning a trip. For the second card, which is only used for incoming cards, roaming data is best turned off to avoid accidental debiting.
Solution: If the phone can't see SIM-map
Sometimes, after installation, users are faced with a situation where the Redmi Note 7 does not define one or both. SIM-First of all, make sure that the cards are active and not blocked. PIN-If requested, PUK-code, it can be found in the contract with the operator or in the personal account.
The second common cause is contamination of contacts. SIM-The cards are soft-sweetened or cloth soaked in alcohol, and check if the contacts in the smartphone tray are oxidized.
What to do if the problem is a software failure?
If nothing works, try installing the cards on another phone to rule out their malfunction.It’s also worth checking if your particular hardware revision of the Redmi Note 7 supports your carrier’s frequency, although this is rarely a problem for major Russian and CIS carriers.
⚠️ Note: Do not use metal objects to clean your contacts. SIM-The metal may leave microscopic scratches on the tracks, resulting in an unstable connection or complete inoperability of the module.
Technical characteristics and network compatibility
For a deep understanding of the capabilities of your device, you should refer to the supported frequency table. Xiaomi Redmi Note 7 is equipped with a modem that supports a wide range of 4G LTE frequencies, which provides high data transfer speeds in most regions.
| Type of network | Supported frequencies (GHz) | Features of work |
|---|---|---|
| 2G (GSM) | 850 / 900 / 1800 / 1900 | Basic communication and SMS, working in both SIMs simultaneously |
| 3G (WCDMA) | 850 / 900 / 1900 / 2100 | Voice and Internet, support for HSPA+ |
| 4G (LTE FDD) | B1 / B3 / B5 / B7 / B8 | High-speed Internet, VoLTE depends on the operator |
| 4G (LTE TDD) | B38 / B39 / B40 / B41 | Additional channels for network unloading |
It is important to note that when activated 4G one-on-one SIM-The second card can be switched to the mode. 2G/3G This is standard behavior for most smartphones in this class and is not a malfunction.
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For maximum internet speed, always choose the card with the best 4G coverage as the primary for data transfer in MIUI settings.
Understanding these characteristics will help you to properly set up your phone depending on your carrier’s coverage area and ensure stable communication in all conditions.