The initial setup of any smartphone starts with a connection to the cellular network, and for owners of new devices this process is key. Xiaomi Redmi 10 model is equipped with modern communication modules, but the physical installation of a memory card or SIM card can raise questions for users who have not previously encountered combined trays. The correct location of the chip ensures stable reception of the signal and no errors in the operation of the MIUI operating system.
In this article, we will discuss in detail how to properly remove the tray, which side to lay the card and what to do if the device does not see the network. We will pay special attention to the nuances of the hybrid slot, which allows you to choose between a second SIM card and a microSD memory card. Following the instructions will help to avoid mechanical damage to the contacts.
Before you start, make sure you are in a well-lit place with a hard surface at hand, so that you don’t accidentally drop a miniature SIM card, which is extremely difficult to find on the floor or carpet.
Preparation for installation and search for tools
The process begins with finding a special tool to extract the tray, which comes with the device. If the original paper clip is lost or lost in the depths of the desk drawer, you can use a regular sewing needle or a thin paper clip, first straightening it. The main requirement for the tool is sufficient strength and a sharp, but not too thin tip, so as not to damage the mechanism of the spring inside the hole.
It is important to prepare the nano-SIM SIM itself in advance, as this is the standard used in Redmi 10. Larger versions of the cards (mini or micro) will not physically fit into the slot and can be damaged if you try to force installation. If your old card, contact the operator's salon for a free replacement or carefully trim the plastic around the circuit using a special stencil, although the latter method is less reliable.
⚠️ Warning: Never try to insert a SIM card when it’s off if you plan to check it right away, however, for the physical installation itself, the power of the device may be turned on. However, experts advise to transfer the phone to flight mode or turn it off before removing the tray, so that the system correctly redistributes the resources of the modem.
Make sure your hands are dry and clean, as fat spots can oxidize golden-colored contacts on the back of the card. Touching metal contacts with your fingers is highly undesirable, holding the SIM card only by the plastic edges. This simple electrostatic safety rule will help avoid reading problems in the future.
☑️ Pre-installing check
Removing the tray and determining the correct side
On the lower end of the Xiaomi Redmi 10 case, next to the USB Type-C charging connector, there is a small circular hole, which requires inserting a tool and applying a moderate force, directed strictly perpendicular to the device body, the tray should be extended several millimeters, after which it can be gently tucked with a nail and removed completely.
Carefully inspect the extracted tray: Redmi 10 uses a hybrid design where one of two SIM card locations can be occupied by a memory card. Usually the tray is asymmetrical with a cutout at one of the corners that corresponds to the shape of the SIM card. It is important not to confuse the sides, since the card must lie in the same plane with the tray frame without protruding above it.
You should be guided by the bevelled corner of the plastic base of the SIM card: it should coincide with the bevelled angle in the tray bed. Golden contacts, when properly stacked, always point downwards to the inside of the tray, not upwards. If the card lies unevenly or there is resistance, then you are trying to insert it with the wrong side or you have confused the orientation.
What to do if the tray is stuck?
In some regions, versions of the smartphone with two separate trays are sold, but the Redmi 10 model is characterized by a single combined slot. This means that you can not use two SIM cards and a microSD memory card at the same time. You will have to choose between two active communication lines or one line and an extended storage for photos and videos.
Installation scheme: hybrid slot and card formats
The tray design in Xiaomi Redmi 10 provides two seats for cards, which are often marked with the numbers 1 and 2 or have different geometries. Slot 1 is usually designed for the main SIM card, and slot 2 is hybrid. In some versions, both slots support 4G/LTE, but priority is given to the first card when switching network modes.
If you plan to use a memory card, it is installed in the second socket on top of the contacts of the second SIM card or in a specially designated place nearby, depending on the tray revision. When installing the microSD, make sure that it does not block the contacts of the SIM card, if the design suggests it. Incorrect installation can lead to short circuit or mechanical damage to the pins inside the phone.
| Position in the tray | Type of card | Features of installation | Network priority |
|---|---|---|---|
| Slot 1 (external) | Nano-SIM | Contacts down, bevelled angle matches | Major (Default) |
| Slot 2 (internal) | Nano-SIM / microSD | Hybrid place, requires a choice | Secondary |
| Slot 2 (alternative) | microSD (up to 1 TB) | It is installed instead of the second sim | Not applicable. |
For users who are critical to both SIM cards and a large amount of memory, there is an alternative solution: you can use a SIM card with eSIM technology if the operator and region support this feature, although in Redmi 10, a physical hybrid slot is more common. In this case, the memory card can be connected via an external OTG-Adapter, but it is less convenient for permanent use.
💡
Use a UHS-I or higher speed memory card to record high-resolution video. Slow cards can cause delays when shooting or saving files to the gallery.
Enabling the device and initial network setting
Once the tray is returned to its place before the characteristic click, you can turn on the smartphone. When you first boot, Android automatically detects a new SIM card and launches the setup wizard. PIN-code, if you have previously installed protection on the card, or offer to configure the settings of the mobile network.
In the settings menu, going along the Settings path → SIM-You can see the list of active cards, you can assign names to operators, such as "Work" or "Personal" to avoid confusion when calling. 4G/LTE for maximum internet speed.
If the Internet is not automatically running, you may need to manually register the access points APN. Usually this data comes in the form of SMS from the operator or downloaded automatically, but in rare cases it must be entered manually, taking information from the official website of the provider.
⚠️ Note: When setting up two SIM cards, be sure to check which one is the default for data transfer. If this option is not set, the Internet may not work even if there is a signal, as the phone will wait for your choice for each new connection.
Diagnostics of problems with the definition of the SIM card
Sometimes, once installed, users will be confronted with a message saying, "Sim card not found" or "No network." The first step in diagnosis is to reboot the device in a banal but effective way. If that doesn't work, remove the tray and check if the card is sitting tightly in the nest. Sometimes, the plastic transient frames that the nano-SIM is inserted into can become slightly deformed and interfere with contact.
Check the contacts on the SIM card itself: they must be clean, without scratching or oxidizing, you can gently wipe them with a soft cloth, not fuzzy, and you should also try installing the card in another phone to rule out the chip itself, and if the card is working on another device, then the problem is in the slot or the Redmi 10 software.
In rare cases, the problem lies in a software failure of the communication module. Try resetting the network settings to factory settings by going to Settings → Connection and Sharing → Reset Wi-Fi, mobile network and Bluetooth. This action will remove stored Wi-Fi passwords and Bluetooth pairs, but often restores the correct operation of the communication modules.
If the phone says "Emergency Calls Only", it may mean that the SIM card is blocked by the operator or not activated. Contact your carrier's support to clarify the status of the number, and make sure that there are no preventive work on cell towers in your region.
💡
If the SIM card is not detected in any phone, it is likely that it is physically damaged or permanently out of order - a replacement is required from the operator.
Optimization of two SIM cards in MIUI
Xiaomi Redmi 10 owners using two SIM cards should pay attention to the flexible settings of the MIUI shell. The system allows you to configure different behavior scenarios for each card. For example, you can set the second SIM card to be used only for calls, and the Internet works exclusively through the first one, which helps save traffic and battery power.
Smart Constraints allows you to limit the background activity of applications for the second SIM card if it is rarely used, this is especially useful if the second card is only needed to receive confirmation SMS codes, and you can set a schedule for switching on and off SIM cards, for example, to turn off the work card on weekends.
To save energy, it is recommended to turn off 5G if coverage in your area is unstable, as constant network search is consuming battery life.Switch to 4G mode preferably in mobile network settings. This will ensure a stable connection without unnecessary battery surges.