Xiaomi Redmi 4 Pro is one of the most popular budget smartphones of 2017, which is still used by many users due to its reliability and good performance. However, even at such a verified time of the device, questions may arise about the basic setting, for example, how to install correctly. SIM-It's a tricky thing to do, but in practice, people have problems: the phone can't see the card, the slot is jammed, or you don't know what nano-SIM or micro-SIM format you want.
In this article, we will not only explore the standard installation procedure, but also the nuances that are not mentioned in the official instructions, such as why the Redmi 4 Pro may not recognize the second one. SIM-You can also find a card while using a memory card, or how to remove a tray without a paper clip, and you can find relevant tips for choosing an operator for this smartphone and a format compatibility table. SIM.
Preparation: what SIM-card format is needed for Xiaomi Redmi 4 Pro
Xiaomi Redmi 4 Pro supports two physical slots SIM-But with the important nuance, the second slot is hybrid, which means you can choose between two options:
- 📱 Two nano-SIMs (for two numbers at the same time)
- 📱 + 💾 One nano-SIM + microSD memory card (up to 256 GB)
Please note: the slot is designed only for nano-SIM (format) 12.3 × 8.8 If you have a card of a different size (standard or micro), it will have to be cut or replaced in the operator's cabin. Using adapters or custom croppings can lead to jamming of the tray or damage to the contacts.
To check what format you have, look at the plastic holder. SIM-maps: it usually shows the contours for pruning. If you're in doubt, it's better to contact the operator - most of them (MTS, Beeline, Tele2, MegaFon) trimming or replacing the card is free of charge.
⚠️ Warning: Don't try to insert a micro-SIM without an adapter into a nano-SIM slot - this can bend the contacts inside the phone.In the Redmi 4 Pro, the tray has no protection against improper installation, so the error is fraught with repairs.
Where is the slot for SIM-Redmi 4 Pro cards: photos and description
In Xiaomi Redmi 4 Pro tray for the SIM-The map is located on the left end of the case, if you look at the phone screen, and it's easy to recognize from the small hole to extract it, which is next to the volume buttons. Here's what it looks like:
The design of the tray is standard for Xiaomi: a metal pallet with slots under two nano-SIMs or one SIM + microSD. On the tray itself there is a marking:
- 🔢 SIM 1 - the main slot (supports) 4G)
- 🔢 SIM 2/microSD – Hybrid slot (or second slot) SIM, memory card)
Important: If you plan to use two SIM-cards, make sure both are trimmed to nano-SIM size.Insert micro-SIM into the slot SIM 2 without an adapter will cause the phone to not be able to read it.
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If you change often SIM-cards, buy metal tweezers to extract the tray - it is more reliable than the paper clip and does not scratch the body.
Step-by-step instruction: how to insert SIM-Map of Xiaomi Redmi 4 Pro
Installation process SIM-It takes less than a minute to do everything according to the instructions:
- Turn off the phone.Although Redmi 4 Pro supports hot replacement SIM-cards (without turning off), it is better to be safe to avoid failures in the operation of the communication module.
- Find the opening to extract the tray, which is located on the left end, next to the volume buttons.
- Put a paper clip (or special key) into the hole. Press until you click, the tray will slide out a little.
- Take the tray out carefully. Don't pull it around the corner, it's better to take both sides so you don't bend.
- Put it down. SIM-Go for the notches: the bevelled corner of the card should match the bevelled corner of the slot.
- Put the tray back in. It should snap without effort. If you feel resistance, check if the cards are correct.
- Turn on your phone. Wait for your smartphone to recognize the network (usually 10 to 30 seconds).
☑️ Preparation for installation SIM-map
If you turn on the phone, you can’t see SIM-map, try it:
- 🔄 Reset the device.
- 🔧 Check if the tray is sitting tight (sometimes it does not fully click).
- 📶 Manually select the operator in the settings: Settings → SIM-maps and mobile networks → Choice of network.
What to do if Xiaomi Redmi 4 Pro does not see SIM-map
After installation SIM-The phone doesn't recognize the card, it can be in the card itself, it can be in the smartphone:
| Problem. | Possible cause | Decision |
|---|---|---|
| The phone doesn't see any of them. SIM-map | Tray or contacts damaged | Examine the tray for bent contacts; try another SIM-map |
| Only the second SIM does not work. | Hybrid slot is configured to microSD | Restart your phone; check the settings in Settings → SIM-map |
| SIM-map is defined, but no network | Operator problems or incorrect APN settings | Reboot phone; manually select network; reset APN settings |
| The tray doesn't fit in until the end. | Miscuttled SIM-map | Check the card for compliance with the nano-SIM format; replace the tray if damaged |
If none of these things worked, there may be a problem with the smartphone communication module, in which case you should contact the service center.
Settings → System and device → Additional → Resetting settings → Resetting network settings⚠️ Note: If you use a hybrid slot for a memory card, then decide to insert a second one SIM-card, remember to remove the microSD in advance. SIM Redmi 4 Pro is not possible!
How to remove a tray without a paper clip: life hacks
Sometimes you don't have a paper clip or a special key to pull the tray out, and you can use the tools you can use.
- 📌 Needle or pin – any thin metal detail that enters the hole will fit.
- 🖊️ The rod from the handle - if it is strong enough, it can be inserted into the hole and pressed.
- 🔑 Watch key – some battery replacement keys in the watch fit in size.
- 📎 Toothpick – if sharpened, it can temporarily replace a paperclip.
The main rule: do not use too thick or fragile objects that can break inside the hole. If the tray is jammed and it does not extend even after pressing, do not make excessive efforts - you should contact the service.
What to do if the tray is stuck inside?
Compatibility of Xiaomi Redmi 4 Pro with operators in 2026
Xiaomi Redmi 4 Pro supports most modern communication standards, but there are nuances that you should know about:
- 📶 4G (LTE) frequency-operate: B1 (2100), B3 (1800), B7 (2600), B38 (2600), B39 (1900), B40 (2300), B41 (2500).
- 📞 3G (WCDMA): B1 (2100), B2 (1900), B5 (850), B8 (900).
- 📡 2G (GSM): B2 (1900), B3 (1800), B5 (850), B8 (900).
In 2026, the smartphone is fully compatible with the main Russian operators:
- 🔴 MTS – All frequencies are supported, including 4G.
- 🟢 Beeline - Possible problems with 4G in some regions (depending on local towers).
- 🔵 MegaFon - Full Compatibility.
- 🟡 Tele2 is stable, but the speed is stable. 4G It may be lower than competitors.
- 🟣 Yota – supported, but only in roaming mode via MegaFon networks.
If you plan to use the Redmi 4 Pro abroad, check with your local carrier what frequencies it uses. In the U.S., for example, the smartphone does not support some LTE B2 (1900) and B4 (1700/2100), which can limit Internet speed.
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For maximum speed 4G Redmi 4 Pro is recommended for use in the SIM-A map of an operator that actively develops a network in a range B40 (2300 MHz) or B7 (2600 MHz – This will provide better coverage in cities.
Frequent errors in installation SIM-maps and how to avoid them
Even experienced users sometimes make mistakes that lead to problems with the user. SIM-Here are the most common ones:
- Using a micro-SIM without an adapter. As mentioned, the slot is only designed for nano-SIM. If you insert a micro-SIM without an adapter, the phone won't recognize it, and the contacts can bend.
- Wrong orientation of the map. Sloped corner to SIM-If you mix the sides, the card should match the angle on the tray, and the phone won't be able to read the map.
- If the tray doesn't come in easily, the card is not installed correctly. Don't push, you'd better pull it out and check again.
- Ignoring the hybrid slot. Many people forget that the SIM 2 slot can be used either for a second SIM or for a microSD. You can't at the same time!
- No reboot after installation. Although the Redmi 4 Pro supports hot replacement, sometimes you need to restart the device to work properly.
If you are not seeing your phone anymore SIM-card after falling or getting moisture, the problem may be in damage to the slot contacts. In this case, self-repair is not recommended - it is better to contact the service.