Installation SIM-Maps to smartphones are one of the most basic but critical operations to get started with a device. - Xiaomi Redmi Note 4 (including Note version) 4X) It is equipped with a combined slot, which allows you to use two SIM-card at the same time or SIM-The card is accompanied by a microSD card, but beginners often have difficulty with the correct orientation of the chip or determining the type of tray.
Incorrect installation can cause the phone to fail to see the network, lose signal or, in the worst case, damage contacts inside the slot. In this guide, we will discuss in detail the process of retrieving and installing communication modules, paying special attention to the nuances of the design of this popular model.
Before you start any manipulation, make sure you have a well-lit workplace, which will help you avoid losing small parts and allow you to clearly see the markings on the tray.
Tool preparation and completeness check
To do this, you'll need a minimal set of tools, which is usually bundled with the device. If the original paper clip is lost, you can replace it with a paper clip or a thin needle, but be careful not to scratch the case or get hurt. The main tool is a special key-clip, which is shaped like an "G" or a round ring with a point.
Before you put it in. SIM-The Nano-SIM standard is the main one for the Redmi Note 4, and if your card is larger, it will have to be cut in a special form or replaced from the carrier. It is important to check that there is no oxidation, dirt or deep scratches on the golden contacts, as this directly affects the quality of the connection with the network.
⚠️ Warning: Never try to insert SIM-If the card does not enter freely, it means that it is not located correctly or is used the wrong type of tray, which can lead to a break in the reader.
Also, wipe the card contacts with soft dry cloth if they look dirty. Fat spots from the fingers can prevent normal electrical contact. Make sure the smartphone is turned off before the operation begins, although Hot-Swap technology allows you to change cards on the go, for the initial setup it is better to work with the device turned off to avoid software failures of network determination.
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Use a magnifying glass or zoom phone camera to consider marking on the tray if you have poor vision – this will help avoid errors with the orientation of the chip.
Slot Location and Types of Trays in Redmi Note 4
Xiaomi Redmi Note 4 slot for the SIM-The map is located on the top end of the case, which is standard for most Xiaomi smartphones of the period, and the structurally, the tray is a metal frame with a plastic insert that is removed vertically upwards. It is important not to confuse this slot with an IR port, which is also on the upper end, but is just a dark window and has no hole for the clip.
There is an important nuance about different versions of the device: the global version and the version for the Chinese market may differ in the design of the tray. In some versions, the second slot is hybrid: it allows you to choose what to use, the second one is a hybrid slot. SIM-MicroSD card or memory card, in other versions all three elements (two) SIM and the memory card) can be installed independently.
To determine the type of tray you have, carefully examine it after you extract it. If you see two notches under the Nano-SIM and a separate microSD location on the back or next to it, you're in luck. SIM-The card is combined with the memory card space, you have to make a choice. Below is a table that helps identify the configuration.
| Slot type | SIM 1 | SIM 2 | MicroSD | Features |
|---|---|---|---|---|
| Hybrid | Nano-SIM | Nano-SIM | No (or instead of SIM 2) | You can not use 2 SIM + memory card at the same time. |
| Triple (separate) | Nano-SIM | Nano-SIM | There's a separate slot. | Full functionality of all three elements |
| Combined (old) | Nano-SIM | MicroSD | Combined | It is rare, only in early reviews. |
Understanding your tray type is critical to planning your device usage. If you’re an active user of two numbers and you’re storing a lot of media on a memory card at the same time, a hybrid slot will become a limitation. In this case, you can consider the options of cloud storage or use. OTG-flash drives, but physically install three elements will not work.
Step-by-step instructions for removing the tray
The process of removing the tray requires precision, but it's technically simple. Find a small circular hole on the top of your smartphone next to the rectangular frame of the tray, and that's where you put the sting of the key-clip, and hold the phone firmly with one hand so that it doesn't slip out when you're pressed.
Insert the paper clip into the hole perpendicular to the body. You don't have to enter it deep, just a few millimeters. Then press it with moderate force. You should feel a slight click of the spring mechanism, and the tray will extend out of the body a few millimeters, then it can be grabbed with your fingers.
⚠️ Note: Do not use sharp objects like knives or sewers to remove the tray, as they can damage internal mechanisms or slip and scratch the screen or hands.
If the tray is not removed, do not use excessive force. Try to slightly change the angle of the staple or push a little harder, but without fanaticism. Sometimes the mechanism can get jammed due to dust or deformation. In rare cases, users try to insert a paper clip into the microphone hole, thinking that this is a SIM slot is a gross error that will damage the microphone.
After extraction, place the tray on a flat surface with a light side up. Notice the shape of the notches: they have a bevelled angle that corresponds to the shape of the tray. SIM-It's not just a decorative element, it's a physical key that prevents you from installing the wrong thing, unless you're using an adapter or you've cut the map curved.
☑️ Pre-installing check
Proper orientation and installation SIM-map
The most important thing is the correct orientation of the chip. The Redmi Note 4 tray usually has a small diagram or pictogram on it that indicates how the card should lie. The golden contacts should always look down to the insides of the phone, and the bevelled corner of the card should match the bevelled angle of the notch in the tray.
Take it. SIM-Make sure it lies exactly in the plane of the tray and doesn't protrude above the edges of the tray, and if the card is raised, the phone may not close or damage the card when you push the tray back in. SIM-map (SIM (1) an internal notch is usually used, closer to the centre of the telephone.
If you use a microSD card hybrid slot, it's mounted in a second notch. Note that the microSD also has a bevelled angle, and it's quite difficult to confuse its orientation, if you're careful. The memory card contacts should also be directed down.
After you've laid the elements, gently push the tray back into the body, it should come in smoothly, without much resistance. If you feel a stress, stop and check if the map is turned over or the tray's antennae are clamped, and you can push the tray in with your finger until you click it, or you can compare it to the body.
What to do if the card is not held in the tray?
Enabling the device and setting up the network
Once the tray is successfully installed, you can turn on your smartphone. Press and hold the power button on the side of the side until the Mi or Redmi logo appears. The boot process will take about a minute. Once turned on, the system will automatically try to identify a new one. SIM-card and register in the operator's network.
Usually, signal level icons and operator designation appear in the upper corner of the screen (for example, MTS, Beeline, Tele2). If you have two sets of SIM-There will be two icons in the settings. → SIM-Maps and mobile networks can be set in detail priorities: which card to use for mobile Internet, and which for voice calls by default.
If the network didn’t come out right away, wait. 1-2 In some cases, you need to manually select the operator in the settings menu if the automatic search didn't work. PIN-code that blocks access, otherwise the phone will request it to be entered when downloaded.
To check the quality of the connection, try to make a test call or open a web page in your browser. 4G/LTE performance depends not only on the correct installation of the card, but also on the network coverage in your area. If the phone shows only E or G, maybe your area has a weak 4G signal, or the 2G Only mode is selected in the settings.
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Proper installation SIM-The card guarantees stable reception of the signal and prevents rapid battery discharge caused by the constant search of the network by the phone.
Problem Solving and Diagnosing Errors
Even if installed correctly, there can be software or hardware failures. One of the common problems is the message «SIM-Card not found" or "Put in SIM-If you're sure the card is set correctly, try erasing the contacts with a pin. Copper oxidation over time is a natural process, especially if the phone is often worn in a wet environment.
Another common situation is that the phone sees only one of the two cards, which could indicate that the tray itself is malfunctioning (the contacts inside the slot may have bent) or that the firmware is failing. SIM-maps in places: if the problem "moved" to another card, then the matter is in the card itself SIM, It needs to be replaced by the operator.
It is also worth checking the settings in the Settings section. → SIM-Maps and mobile networks. Make sure activation sliders are for both SIM-Sometimes, after you update the system or reset the settings, they can be software-based, giving you the illusion of a breakdown.
If nothing helps, check your work. SIM-If the other phone is running and the Redmi Note 4 is not, it probably requires a slot diagnosis at the service center, it may have broken the antenna plume or damaged the reader.
⚠️ Note: Do not use homemade adapters from Micro-SIM to Nano-SIM, if they have protruding parts of plastic.This can lead to a tray stuck inside the case, and it will be impossible to remove it without disassembling the phone.
Finally, the correct installation SIM-Maps in Xiaomi Redmi Note 4 is a simple process that requires only attention to detail. Observing the orientation of contacts and accuracy when working with mechanical elements will ensure a long and stable operation of your smartphone in mobile networks.