Smartphone Xiaomi Redmi 4X While it remains a popular device due to its reliability and availability, new users often have questions when setting up their first connection. SIM-The wrong installation can cause the phone to fail to see the network or, worse, damage the reader's contacts.
In this guide, we will detail the process of installing a nano-symcard in the second slot, explain the differences between a hybrid tray and a regular one, and give tips on software setting up two numbers. It is important to maintain accuracy and sequence of actions to ensure that your Redmi 4X operates in stable two active lines.
Before you start physically removing the tray, make sure the device is turned off or in flight mode, although modern smartphones support hot replacement. However, a reboot is sometimes required to correctly determine a new card by the MIUI system, so it is better to prepare the phone in advance.
Features of the design of the SIM tray in Redmi 4X
Model Redmi 4X It's equipped with a combined tray, which is often confusing for users (SIM 1), and on the other hand, a universal slot. This universal slot can accept either a second slot. SIM-map (SIM 2), either a microSD memory card.
It's critical to understand that you can't have a second SIM and a memory card in the same compartment at the same time, and you have to choose which is more important to you, which is to expand the internal memory of the device or use the second number. The tray is made of metal and has clear contours for Nano-SIM cards.
⚠️ Attention: Don't try to insert SIM-card to a microSD slot or vice versa without the appropriate adapter, as the contacts are located in different planes and this will lead to a short circuit.
To extract the tray, a special paper clip is used, coming in the kit, or a thin point. The extraction hole is on the bottom end of the smartphone, to the left of the Micro-USB charging connector. Press perpendicularly, with moderate force, until the mechanism clicks.
- 📱 The tray supports only Nano-SIM format (smallest size).
- 💾 The second slot is a hybrid: either SIM 2, or MicroSD.
- 🔧 Remove the tray need a special clip or needle.
- 🚫 It is forbidden to use force if the tray does not come out easily.
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If the paperclip is lost, use a paperclip, straightening one of its ends, but be careful not to scratch the case.
Preparation SIM-map
Modern carriers issue Nano-SIM cards that are ideal for the Xiaomi Redmi 4X. However, if you use an old SIM card of large size, it will have to be cropped or replaced by the operator.
Before installing, carefully examine the card chip. It should not be scratched, contaminated or oxidized. If you just received a new card, make sure it is activated. The second SIM often requires checking the balance and tariff plan so that after installation there are no problems with registering on the network.
Notice the bevelled corner of the card. The Redmi 4X tray has a corresponding protrusion that allows you to insert the card in only one correct position. Trying to insert the SIM upside down or into the wrong slot is physically impossible or will result in the card not lying level with the edge of the tray.
☑️ Pre-installing check
If you are switching from another phone, make sure yours is yours. SIM-card not blocked PIN-code if you do not remember it, as after three failed attempts to enter it, you will need to PUK-code to be searched for in the contract or personal account.
Step-by-step instructions for installing the second SIM
The process of installing a second SIM card in Xiaomi Redmi 4X requires care. First, remove the tray by pressing a paper clip into the hole on the bottom end. Place the tray on a flat surface with the chip up to see the marking of the slots.
Take a second SIM card and place it in a slot designated SIM 2 (usually the inside or bottom slot on the tray itself, depending on the revision, but always signed). Make sure the bevelled angle matches the markup and the golden contacts look down to the phone's contacts. The card should fit tightly to the plastic tray base.
Sequence of action:
1. Turn off the phone (recommended).
2. Find the hole on the bottom end.
3. Press the paperclip until you click.
4.Put Nano-SIM into the second slot.
5. Put the tray back to full stop.Once the card is laid, carefully insert the tray back into the case. It should enter smoothly, without strong resistance. If you feel a push, do not press, take out the tray and check the orientation of the map. After installation, turn on the phone and wait for the network icons to appear.
Setup of two numbers in MIUI
Once physically installed, the Xiaomi Redmi 4X will automatically determine the second SIM card. MIUI will suggest setting up the preferred actions for each number.This is an important step, since by default all calls and messages can go through a single card, which will lead to unexpected costs.
Go to the Settings menu → SIM-You can see both active cards here, you can give each one a name (e.g., "Work", "Personal") to keep your contacts in check, and you can set up a priority number for calls and mobile Internet.
| Parameter | Description | Recommendation |
|---|---|---|
| Calls. | Selecting the default card | Always ask or ask the main or |
| Internet | Data map | High traffic map |
| SMS | Message map | Basic or optional |
| VoLTE | Voice over 4G | Include for better quality |
Pay special attention to mobile internet settings. Unlike some other brands, Xiaomi allows for flexible traffic management, and you can set limits for each SIM separately so you don’t accidentally use up the main card package if the second card is used only for calls.
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The correct setting of call and internet priorities in the MIUI menu will save you money and eliminate confusion when outgoing calls.
Possible problems and solutions
Sometimes, after the second SIM is installed, the phone may not see the network or show a "No Service" status, which may be due to a loose attachment of the tray contacts or a software failure of registration in the operator's network. The first step should always be to restart the device.
If the problem persists, check the access point settings. APN For the second SIM, the automatic settings are often not applied correctly. → SIM-maps and mobile networks → (Choose. SIM) → Access points (APN). The options for your operator are easy to find on the official website of the provider.
⚠️ Note: If the phone is writing "SIM-card not found" only for the second slot, try to wipe the contacts of the SIMKA soft eraser or alcohol napkin.
Another common issue is frequency conflict. Redmi 4X supports 4G, but if in your region the second operator uses rare frequencies, the phone can switch to 2G/3G. Check if 4G mode is enabled in the settings of the preferred network type.