Owners of the popular Xiaomi Redmi Note 7 smartphone often face the need to replace or initially install the communication module, especially after buying a device or changing the operator. Despite the seemingly simple procedure, improper actions can damage the tray or the chip itself, which requires contacting the service center. SIM-Types of supported cards and possible software errors.
Modern smartphones, including the Redmi Note 7, are equipped with combined slots, which requires special attention when installing. It is important to understand the difference between card formats and correctly navigate the chip relative to contacts.
We've prepared a comprehensive guide to help you avoid common mistakes: you'll learn how to safely remove the tray, which side to place the card, and what to do if the device stops seeing the network after replacing the SIM. The Redmi Note 7 tray has a specific design with a spring that pushes the card out, so you need to insert it before the characteristic click.
Preparation for installation and types SIM-map
Before you start a physical installation, you need to make sure you have the right size module on your hands. Redmi smartphones work exclusively with Nano-SIM, which is the smallest of the existing standards. Adapters or larger cards are strongly discouraged, as this can lead to a tray getting stuck inside the case.
If your SIM card is larger, don’t try to cut it yourself with scissors. The best solution is to contact your carrier’s salon for a free Nano-SIM replacement, which ensures that the chip has the correct geometry and does not damage the phone’s contact group.
It's also worth checking the tray and the contacts on the map, which should be free of oxides, dust or fat spots, and you can use soft tissue without pile, slightly moistened with alcohol, but only after you remove the card from the phone.
⚠️ Warning: Never use metal objects other than a special paper clip to remove the tray. Sharp tools can damage the spring mechanism or affect the battery if the hole is not located well.
Make sure the phone is turned off before you start manipulating. Although current standards allow hot replacement, it is better for the Xiaomi Redmi Note 7 and the stability of the communication module to perform all actions when the power is turned off, this will prevent possible software failures in determining a new operator.
Tools and tray extraction
You only need one tool to do the surgery, a key-clip that comes with the phone, and if the original paperclip is lost, you can use a regular paperclip to straighten one of the ends, so that the diameter of the tool matches the hole in the end of the case.
Find a small circular hole on the bottom of the Redmi Note 7, next to the USB Type-C connector and speaker, and be careful, there may be a microphone nearby, and piercing the hole will cause permanent damage.
☑️ Pre-installing check
Put the paper clip into the hole and apply a small but steady force perpendi-cular to the body. The tray should partially move out. Then gently pull it with your fingers until fully removed. Don't put too much effort if the tray is not moving - you may not have hit the latch mechanism.
- 📱 Find a hole on the lower end of the case next to the charging port.
- 🔧 Insert the paper clip strictly perpendicular, avoiding tilting.
- 💪 Press until the click of the mechanism and remove the platform with your fingers.
- 👀 Inspect the tray for damage or contamination.
The design of the tray in Xiaomi often involves two seats for cards or a combination of SIM and microSD. Carefully study the shape of the cutouts so as not to confuse the slots. They usually have different sizes or markings.
Proper orientation and installation SIM-map
The most critical point is the correct orientation of the card in the slot. The Redmi Note 7 tray usually has a schematic image indicating how the card should lie. The cut corner of the SIM card should match the cut angle on the tray. If the angles do not match, the map simply will not fall into the notch.
The Redmi Note 7 uses a combined slot, which means you can use either two SIM cards, or one SIM card and one microSD card. You can't install two SIMs and a memory card at the same time. Choose the configuration you need right now.
What to do if the card is not fixed?
Place the card in the notch carefully, without skewing. It should lie absolutely flat. If you feel resistance, do not push, most likely, the map is turned or moved to the side. The contacts of the map should be directed down to the contacts of the tray.
After you've placed the card in the first slot, if necessary, install a second card or microSD in the adjacent compartment. Make sure the cards don't bump into each other or protrude outside the tray. Any performance can cause a breakdown when inserted into the phone.
Inserting the tray back into the smartphone
Putting the tray back in place requires a certain amount of care. Unlike retrieval, it's important not to bend the contacts. Keep the tray flat, parallel to the hole in the case. A millimeter skew can cause the cards to move or the tray to jam.
Put the tray in smoothly, without jerking. It should come in fairly easily. If you feel strong resistance, stop, remove the tray and check the orientation of the cards again. Often the problem is that the microSD card is mounted on top of the SIM card or vice versa, disrupting geometry.
| Phase | Action. | Important nuance |
|---|---|---|
| 1 | Extraction | Press strictly perpendicularly |
| 2 | Orientation | The cut angle must be the same. |
| 3 | Installation | Map is flat, contacts down |
| 4 | Insertion | You have to come in easily, without effort. |
When the tray enters the body almost completely, you can press it slightly before you click, which means that the mechanism is snapped, and the cards are fixed, and then you can turn on the phone.
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If the tray is tight, try to sway it slightly from side to side, aligning the position. Do not use glue or lubricant to facilitate the ride!
Network settings after installation
Once the Xiaomi Redmi Note 7 is turned on, the system should automatically detect a new SIM card. In the upper status bar, signal level icons and operator designation will appear. If this does not happen, or the icon of the crossed-out SIM appears, manual adjustment will be required.
Go to the settings menu by selecting Settings → SIM-maps and mobile networks. Here you'll see a list of installed cards. If the phone suggests updating the access point settings (APN), It's necessary for the mobile Internet to work properly.
You can also set up a priority card for calls and mobile internet from the same menu. 7 support 4G on both SIM cards, but simultaneously in mode LTE There's only one that can work. The other one will work. 2G/3G.
- 📶 Check if the flight mode is activated (it should be turned off).
- 🌐 Make sure data transfer is enabled for the right SIM card.
- 🔄 If you don’t have a network, try restarting your device.
- ⚙️ Check the settings of the preferred network type (LTE/3G/2G).
If you're using a memory card, the system can ask permission to use it or format it. Be careful: formatting will delete all data. If the card is new, feel free to format it. If it has data, choose the use case as a portable storage device.
Diagnostics of SIM Definition Problems
Redmi Note 7 is not often seen, but it is, most often because of contact oxidation or software failure, and first try to wipe the SIM contacts with a soft wipe or an alcohol wipe.
⚠️ Warning: If the phone says "No" SIM-After falling or getting moisture, do not try to charge the device. moisture inside the housing could cause a short circuit in the power supply module communication.
Software resetting network settings often helps solve the problem. Go to Settings → Advanced Settings → Recover and Reset → Reset your Wi-Fi, mobile Internet and Bluetooth settings. This action will not delete your personal files, but will return network settings to factory values.
It's also worth checking if the SIM card is locked by the operator, insert it into another phone to rule out the chip itself. If the other device is running and Xiaomi isn't, the problem could be frequency compatibility or damage to the reader.
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If the SIM card is not detected in any slot, and in other phones works properly, a hardware malfunction of the SIM reader in the smartphone itself is likely.