Installing a mobile operator card is the first action you need to perform after buying a new smartphone or resetting it to factory settings. Xiaomi’s Redmi Note 7 features a hybrid slot, which allows you to use either two Nano-SIM SIM cards, or one SIM card and a microSD memory card. Proper placement of the chip in the tray is critical for the stable operation of the device and no problems with signal reception.
Unlike older phones where the battery had to be retrieved, in modern gadgets, all manipulation is done through the side end of the case. Redmi Note 7 is no exception, and to access the slot you will only need a special key-clip coming with the kit, or a thin needle. installation errors, such as the wrong orientation of the chip or the use of a damaged card, can lead to the fact that the device will not be able to register with the operator's network.
This guide will help you avoid common mistakes and set your network priorities for calls and mobile Internet, and we will look not only at the physical installation, but also at the software settings that you need to check immediately after you turn on the device, which will ensure maximum data speed and high-quality voice communication.
Tool preparation and compatibility check
Before you start physically affecting the body of the smartphone, you need to make sure that you have all the necessary components at hand. To work with the SIM card tray in the Xiaomi Redmi Note 7, you will need a special clip, which is usually in the box with the device. If the original key is lost, you can use a thin needle or straightened stationery clip, but you need to act extremely carefully so as not to damage the extraction mechanism.
It is important to check the format of your SIM card. Modern smartphones, including the Redmi Note 7, work exclusively with Nano-SIM cards. This is the smallest of the existing formats, where the plastic frame around the chip is minimal. If your SIM is larger (Micro-SIM or standard), you need to contact the carrier’s salon for a free replacement or carefully trim it along the circuit, although the latter method carries the risk of damaging the chip.
- 📱 Make sure the smartphone is turned off or in flight mode before removing the tray.
- 🔍 Check the SIM card contacts for oxides, contaminants or physical damage.
- 🔑 Find the original paperclip or prepare a thin needle with a sharp tip.
- 💡 Clean the surface of the table so that a small SIM card that accidentally fell out does not get lost.
Also worth paying attention to the condition of the tray itself. In a hybrid slot, the contacts are on both sides, and it's pretty easy to confuse the sides when you build them, if you don't pay attention. Make sure that there's no dust or pile in the slot that could get there when you transport the device. The purity of the contacts is the key to a stable connection to the operator's network.
Anatomy of the tray and the correct location of the cards
The sim card tray in Xiaomi Redmi Note 7 is located on the bottom end of the device, to the left of the USB Type-C charging port. It is a thin metal frame with two indentations. One of the indentations is designed exclusively for the Nano-SIM card, and the second is hybrid: it can accept either a second Nano-SIM or a microSD memory card. Understanding this design is necessary for proper installation.
If you look closely at the tray you'll notice that one side has a bevelled angle, which is a bevel that mimics the shape of the SIM card and serves as a visual guide. The SIM chip should always be pointing down to the tray contacts, and the golden contacts should look up if you hold the tray outside of you. However, depending on the side of the tray, the orientation can change, so always check the shape of the cutout.
⚠️ Warning: Never try to insert a SIM card by force. If the card does not fall into the notch smoothly and without resistance, then you have chosen the wrong side or misidentified the orientation of the chip. Forced installation can break the contacts inside the phone.
The hybrid slot has its own features. If you plan to use two SIM cards, the microSD card cannot be installed simultaneously. You have to choose between two communication lines or one line and extended memory. To install the second SIM card, it is placed in the inner recess of the tray, on top of which the memory card is then placed if the second line is not used. In the case of the Redmi Note 7, both positions for SIM cards are equivalent to supported communication standards.
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Use the original paperclip from the kit, as its thickness is ideal for the extraction mechanism. Too thin a needle can bend inside, and too thick can damage the latch.
Step-by-step instructions for installing a SIM card
The process of installing the SIM card in the Xiaomi Redmi Note 7 takes less than a minute, if you act confidently and according to the instructions. First find a hole on the bottom end of the smartphone. Push the tip of the clip perpendicular to the surface of the case into the hole and press until the click. The tray will extend out of the case by several millimeters, after which it can be removed with your fingers.
Put the tray on a flat surface. Take a Nano-SIM SIM card and make sure the bevelled angle matches the bevelled angle on the tray. Place the card in the appropriate recess. It should fit tightly and not stagger. If you use one SIM card, it is recommended to insert it into the SIM 1 slot, as it often has priority for default settings, although in MIUI this is easy to reconfigure.
☑️ Checking the installation of the SIM card
Carefully insert the tray back into the body of the smartphone. Make sure you don't confuse the top and bottom of the tray -- it has only one correct position. Press the tray smoothly, without jerking until it's completely equal to the frame of the case. You should feel a slight thrust at the end of the turn. After that, you can turn on the device.
If you use two SIM cards, make sure they both are securely fixed. The second card is installed in the remaining free space on the tray, but remember the hybrid slot limitation: if you are occupied by the second position with a SIM card, space for microSD becomes unavailable. In the Redmi Note 7, both SIM cards support 4G, but they can not work at high speeds at the same time - one will be in standby mode.
Set up network and priorities in MIUI
After turning on the smartphone, the Android system with a shell MIUI It will automatically detect SIM cards installed. You may see notifications on the screen asking you to configure new cards. You need to go to the settings to work properly. Go to the Settings menu, then select the option. SIM-Maps and mobile networks. This shows both maps installed.
In this section, you can give each card its own name (e.g., "Work", "Home", "Internet"), so as not to confuse notifications. Also, here you can configure the network type. For each card, you can choose your preferred network type: LTE, 3G or 2G is preferred. For modern use, it is recommended to leave the setting Preferably LTE, which will allow the phone to automatically switch to the fastest communication standard available.
| Setup parameter | Recommended value | Description of the impact |
|---|---|---|
| Type of network | LTE is preferred | Provides maximum Internet speed (4G) |
| Transfer of data | Card 1 (or primary) | Determine which SIM will go through the Internet |
| Voice calls | Always Ask / Card 1 | Selecting a SIM for an outgoing call by default |
| SMS | Map 1 | SIM used to send default messages |
Special attention should be paid to setting up data roaming if you plan to travel abroad. SIM-Maps and mobile networks have a data roaming switch, which is turned off by default to avoid accidental charges, only turn it on when necessary and the operator has the right tariff.
Solution: the phone does not see the SIM card
Sometimes, once installed, users are faced with a situation where the Redmi Note 7 does not see the SIM card or writes "No service." The first step in the diagnosis is to check the purity of the contacts. Remove the tray and wipe the golden contacts of the SIM card with a soft dry cloth. Even an imperceptible layer of fat or oxide can disrupt the connection.
The second common cause is frequency incompatibility or damage to the card itself. Try moving the SIM card to another slot (SIM 1 to SIM 2). If both slots are marked with "No SIM card", the problem is most likely the carrier's chip itself, in which case, contact the carrier to change the card to a new one.
⚠️ Warning: If the phone suddenly stops seeing the SIM card after falling or getting moisture, do not try to "design" the slot multiple extraction. This can permanently damage the plume or contacts inside the device.
A software failure can also be causing the problem. Try resetting your network settings. Go to Settings → Advanced Settings → Restore and Reset → Reset your Wi-Fi, mobile network and Bluetooth settings. This action will not delete your personal data, but will return network settings to factory values, which often helps restore registration on the network.
What to do if the SIM card is cut manually?
Using two SIM cards: the nuances of work
Owners of Xiaomi Redmi Note 7 It's common to use two SIM cards to separate work and personal contacts or to save on tariffs from different operators. 4G On both cards, there's only one card that can be running at a time in high data rate mode. 2G/3G for receiving calls and SMS.
MIUI has a handy "Intelligent Network Selection" feature, but it doesn't always work perfectly. You'd better manually specify which card will be used for mobile Internet. It's usually the card with the highest traffic packet. You can set the "Always Ask" mode for calls, and before each call, the phone will ask you to select a SIM, or assign the default primary card.
- 📞 Set up different tunes for each SIM card to understand which number you are being called to without looking at the screen.
- 🌐 Use the Turbo Mode feature in the Security app to optimize the Internet speed on the active map.
- 📉 Keep track of traffic consumption for each SIM separately in data usage statistics.
With active use of two SIM cards, battery consumption can increase, since the communication module supports a connection to two towers at the same time. If you are in the zone of weak signal, the phone will constantly search for the network, which drains the battery even faster. In such situations, it makes sense to temporarily disable the second SIM card programmatically through the control panel.
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The main conclusion: For stable operation of two SIM cards, it is important that both are registered on the network, and LTE priority is assigned to the one through which you plan to use mobile Internet.