Xiaomi Redmi Note 7 remains a popular device due to its excellent price-performance ratio and Dual SIM support. However, users often have difficulty installing two SIM cards correctly due to the specific design of the tray. Unlike older models, it uses a combined slot, which requires careful installation.
Installing chips incorrectly can cause one card to be undetermined or the phone to be unable to operate in 4G LTE mode on both lines at the same time. It is important to understand the physical structure of the tray and the software features of the MIUI shell to avoid common mistakes. In this article, we will discuss the installation and configuration process in detail.
Before starting the procedure, make sure the device is turned off, although modern smartphones support hot replacement. However, it is preferable to manipulate the power off to initially set up and correctly identify the networks, which ensures that the system correctly recognizes new communication profiles when booting.
Tray design and tool preparation
Tray for SIM-cards in Redmi Note 7 is located on the lower end of the case, to the left of the connector USB Type-C. Removal will require a special clip (company) or a thin needle.The feature of this smartphone is a hybrid design of the slot, which often confuses users.
If you look closely at the tray, you'll notice that one of the positions, usually the second one, has two pads on different sides of the substrate, which is designed to save you space, allowing you to use either a second nano-SIM or a microSD card. Simultaneous use of two SIM cards and a memory card is impossible without the use of cloud services or OTG-flash-drive.
⚠️ Attention: The tray has a strictly defined orientation. Do not try to insert it with the back side or with effort, as this can damage the contact pins inside the smartphone.
You will need to work:
- 📱 Xiaomi Redmi Note 7 with the screen off.
- 📎 Paperclip for tray extraction.
- 💳 Two active SIM-Nano-SIM maps.
- 🧼 Dry wipe for cleaning contacts (if the cards are old).
Step-by-step instructions for installing two SIMs
The installation process requires care, because the nano-SIM cards are very thin and easily damaged. First, press the paper clip into the tray hole and remove it, put the tray on a flat surface and carefully examine the markings that are stamped on the metal.
☑️ Pre-installing check
The Redmi Note 7 tray usually has two main seats. the first seat (Slot 1) is reserved for the only seat available. SIM-Second place (Slot 2) is a combined one with a second place. SIM, And the reverse card is for a memory card, and to use two SIMs, the second card needs to be placed on the outside of the tray, on top of the microSD contact pad.
Make sure the bevelled corner of the card matches the bevelled angle on the tray. The card contacts should look up (outside) if you install it on top of the memory slot. After placing both cards, gently insert the tray back into the case until the characteristic click. Don't leave the tray sticking out, this will break the tightness of the case.
Dual SIM setup in MIUI interface
Once the smartphone is turned on, the system will automatically detect the installed modules. PIN-The code, the device will request it to be entered. The initial setting is made through the Settings menu. → SIM-maps and mobile networks. Here you can prioritize each card.
Modern versions of the MIUI shell offer flexible traffic and call management, you can choose which card will be used for mobile Internet by default and which for voice calls, and smart calls are also available, where the phone asks which card to make a call from if the number is not saved in contacts.
To activate the second line, make sure that the switch opposite the corresponding slot is on. If the system does not see the second card, try rebooting the device. In rare cases, you need to activate the service from the carrier, especially if VoLTE technology is used.
4G and the choice of the main card
An important aspect of using two SIM cards is support for high-speed Internet. Redmi Note 7 supports networking. 4G, But technically, only one card can work in the mode. LTE The second card, when you're talking or using data, can switch to the second card. 2G or 3G.
In the mobile network settings, you can select the "Main Map" for data transfer. This is where high-speed Internet will be available. When calling from the main card, the second line may not be available unless VoLTE (Voice over LTE) is enabled, which allows you to conduct a conversation in parallel with data transfer without falling into 2G.
| Parameter | Slot 1 (Main) | Slot 2 (Combie) |
|---|---|---|
| Map format | Nano-SIM | Nano-SIM / microSD |
| 4G support | Yes (main) | Yeah (on switching) |
| Contacts | Golden. | Golden. |
| Location. | Inside the tray | Outside (above memory) |
To switch 4G between SIM cards, you don't have to physically rearrange them, just go to the settings and select the card you want to use at "Internet Map," and the system will reconnect to the network in a few seconds.
Expanding memory instead of the second SIM
If you're critically interested in two SIM cards and a memory card at the same time, the Redmi Note 7 doesn't have the physical limitations of the tray, but there are alternatives, although less convenient.
One option is to use cloud storage (Google Photos, Yandex.Disk) to free up space, which allows you to use a second SIM card slot. SIM-Cards with a large amount of internal memory (NFC-SIM), Although such tariffs are rare.
Can I use a microSD and SIM adapter at the same time?
The most reliable way is to use cloud services or external ones. OTG-A flash drive to transfer files, leaving the second slot free for the second SIM card, which ensures the radio module is stable and there are no problems with overheating.
Solution: Card not determined
If one of the SIM cards is not identified after installation (a cross burns or "No net"), check the purity of the contacts. Fat spots or oxidation may interfere with the connection. Wipe the chip with a soft dry cloth. Also make sure that the card is not cut crooked and dangles in the tray.
⚠️ Note: If you are using hand-cutting SIM-card, make sure the thickness of the plastic does not interfere with the tight fit of the tray.
In the software part, it is worth checking whether it is blocked. SIM-map PIN-code that was changed earlier, also in the settings SIM-maps and mobile networks make sure that the switch for a particular slot is activated. Sometimes it helps to reset the network settings to factory.
💡
Use a plastic card from the kit SIM-It's like a template to check if your nano-SIM is evenly cropped. If it's wobbling in a big slot, it's not exactly cropped.
Features of work in roaming
When traveling, Dual SIM becomes especially useful: You can leave the main Russian card for receiving SMS from banks, and in the second insert a local SIM card for cheap Internet. Redmi Note 7 supports most of the world's frequencies.
Be sure to turn off data transfer for the main card before you travel to avoid charging for roaming. In the mobile network settings, you can prevent data transfer in roaming for a particular slot, leaving voice communication active.
💡
The main principle of two SIMs in Redmi Note 7: one card is always active for 4G, the second is in standby 2G/3G, switching to 4G only if the first is occupied or turned off.