Installing a carrier card is a primary procedure that every owner of a new or newly purchased used smartphone faces. Xiaomi’s Redmi Note 3 was a hit with its metal body and powerful Snapdragon processor, but the design features of this device require careful attention when working with a card slot.
Installing the chip incorrectly can cause the phone to stop seeing the network, or worse, damage the contact module itself. In this article, we will discuss in detail where the tray is located, which side to place the chip and how to avoid the typical errors typical of owners of this model.
Special attention should be paid to the differences between the Pro and the regular versions, since the location of the slots may differ from them. We will also touch on the topic of combined slots, which is relevant for budget modifications of the gadget.
Preparation for installation and search for tray
Before you start physically affecting the body of the device, you need to make sure that you are in a safe environment, and it is best to manipulate the table with a soft coating or spread fabric, this will prevent the fall of small parts, such as the very first part of the table. SIM-map or paper clip, in hard-to-reach places.
The card tray in Xiaomi Redmi Note 3 is located on the top end of the case. Unlike many modern smartphones, where slots are on the side, here the engineers chose the top placement. It is easy to find it: it is a narrow strip adjacent to a metal frame, often having a barely noticeable hole next to it.
⚠️ Warning: Never try to remove the tray using sharp objects like sewing needles or knives. A thin sting can break inside the hole, and then it will be almost impossible to remove the stuck mechanism without disassembling the phone.
Retrieval requires a special key that comes with a kit, or a regular stationery clip that is straight-lined, and you press it right perpendicular to the plane of the end, with a confident but not excessive force, and it's springy, so you push the tray out.
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If the tray does not extend after pressing, try to slightly press it with your finger on the opposite side of the body to fix the mechanism, and try again with the key.
Determination of the tray type and smartphone version
Once the tray is removed, it is important to correctly identify its type, since the sequence of actions depends on it. There are two main variants for the slot design for this model, and they are not interchangeable in terms of functionality.
The first option is a classic combined slot, where one seat is for the Micro-SIM and the second is for the MicroSD card. The second option, more rare in some regions, can have two separate seats for two SIM cards, but without the support of memory cards through this tray. Carefully inspect the extracted part.
- 🔍 Option A: Two separate nests of the same size, one marked with the number 1, the other with the number 2.
- 💾 Option B: One SIM card slot and one wider or composite memory card slot.
- 📶 Option B: Hybrid slot, where the choice is between a second SIM card and flash memory.
The Redmi Note 3 Pro version is most often equipped with a hybrid slot, which means you can use either two SIM cards, one SIM card and one memory expansion card.
Instructions: How to insert correctly SIM-map
The most important step is to place the chip in the pad. The standard size for the Redmi Note 3 is Micro-SIM. If your card is Nano-SIM (the smallest) or Mini-SIM (the largest, like a credit card), you need to use the appropriate adapter or gently break the chip down the circuit, if the design of the plastic base allows.
Notice the shape of the notch in the corner of the card, which should match perfectly the shape of the notch in the tray, the contacts (the golden part) always point downwards to the inside of the tray, when viewed from the front of the phone case, the cut corner usually matches the marking or shape of the nest itself.
☑️ Correct installation of the map
When stacking, make sure the card lies flat and doesn't protrude over the edges of the plastic or metal base.If the card dangles or lies above the level of the sides, you risk damaging the contact pins inside the phone when inserting the tray.
⚠️ Note: Do not insert the tray if the memory card or SIM-The card is incorrectly installed (contacts upwards), which can lead to short circuit and motherboard failure.
Use of MicroSD memory card
For many Xiaomi users, expanding internal memory is a priority. MicroSD cards allow you to store thousands of photos, music and videos without taking up space in the system partition. Redmi Note 3 supports cards up to 128 GB, although modern 256 GB and 512 GB cards also often work with a stable.Installation of the memory card is done in the same slot as the second SIM card if you have a hybrid slot. The card is inserted over or next to the SIM card, depending on the design of the particular tray. Usually, a special indent is provided for microSD.
If the phone does not see the card after installation, try formatting it through the menu of the smartphone itself: → Memory. → SD-map → Format.
| Parameter | Slot 1 (SIM 1) | Slot 2 (SIM 2/SD) |
|---|---|---|
| Type of card | Micro-SIM | Micro-SIM or MicroSD |
| 4G support | Yes (main) | Yeah (on switching) |
| Contacts | Down. | Down. |
| Hot replacement. | Not recommended | Not recommended |
What if the tray doesn't fit?
Completion of installation and network configuration
Once the cards are placed in your nests, you need to carefully insert the tray back into the phone case. Watch your orientation: the tray only enters one side. If you feel resistance, turn it 180 degrees. Force is strictly forbidden.
Turn on your smartphone. MIUI It will automatically detect new maps, and a notification will appear on the screen. SIM-If you have two cards, the phone will ask you which one is the default mobile Internet card and which one is the default mobile Internet card.
To activate the Internet, go to the Settings menu → SIM-You can set the parameters for each slot separately here, make sure that the mobile Internet switch is activated for the card you want.
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Properly installing the tray before the characteristic click guarantees reliable contact and protects the device from dust and moisture.
Typical problems and ways to solve them
Even when installed correctly, there can be situations when the phone does not see the card, most often due to oxidation of contacts or software failure. Try gently wipe the golden SIM card chip with a soft eraser or an alcohol napkin.
Sometimes the problem lies in the tray itself, and over time, the contacts inside the tray can become oxidized or deformed, visually inspect the tray for damage, and if the contacts are bent, you can try to correct them carefully with a thin needle, but you need to do this with extreme caution.
- 🔄 Restart the device after installing the card.
- 🧹 Wipe the SIM card contacts with a lastic.
- ⚙️ Check the settings in the menu "SIM-maps and mobile networks".
- 📡 Make sure the card is active and not blocked by the operator.
If none of these methods worked, the reader in the phone may have malfunctioned or the card may have been physically damaged, in which case it is recommended to check the SIM card on another device.