Xiaomi Redmi 3S — One of the most popular budget smartphones of 2016, which is still in demand due to its reliability and low price, but users often have confusion about the choice of the smartphone. SIM-Unlike today's flagships, where the Nano-SIM standard has become universal, Redmi is a very popular model. 3S It supports two formats at once, and its hybrid slot adds additional questions. SIM-The card is suitable for Xiaomi Redmi 3S, How to install it correctly and what nuances it is important to consider when choosing a tariff or operator.
Let's just say: Redmi 3S It is equipped with a hybrid slot that allows you to use either two Nano-SIMs or one Nano-SIM. + A microSD card up to 256GB, which is a key factor in how you choose the format and trim it. If you're planning to expand the memory, you'll have to sacrifice a second card. SIM-We'll go through all the options, including compatibility with the map. 4G, Features of pruning and possible problems in installation.
Technical characteristics of the slot SIM Xiaomi Redmi 3S
Xiaomi Redmi Model 3S (The code name lando has the following features for the slot SIM-map:
- 📱 Type of slot: hybrid (combined) — SIM1 + SIM2/microSD.
- 🔢 Supported formats: Nano-SIM only (4FF) Micro-SIM or Mini-SIM will not work without trimming!
- 🌐 Compatibility with networks: both SIM-card 4G LTE, but with limitations (see table below).
- ⚡ Feature: When using two SIM-MicroSD card slot is blocked.
Important: in some regions sold modification Redmi 3S Prime with a fingerprint, but a slot SIM It's the same as the standard version. 3X (land code – it has a slot not hybrid, but separate slots for two Nano-SIMs + microSD. Clarify your device model in settings along the Settings path → The phone. → Model!
| Parameter | Xiaomi Redmi 3S | Xiaomi Redmi 3S Prime | Xiaomi Redmi 3X |
|---|---|---|---|
| Slot type | Hybrid (SIM1 + SIM2/microSD) | Hybrid (SIM1 + SIM2/microSD) | Three separate slots (SIM1 + SIM2 + microSD) |
| SIM format | Nano-SIM (4FF) | Nano-SIM (4FF) | Nano-SIM (4FF) |
| 4G support | Yes (both) SIM, not simultaneously) | Yes (both) SIM, not simultaneously) | Yes (both) SIM, not simultaneously) |
| Max, the volume of microSD | 256GB | 256GB | 256GB |
⚠️ Note: If you are buying a Redmi 3S Check the integrity of the tray for SIM-Often, when the card is not trimmed carefully, the trays deform, leading to poor contact and lack of network.
What? SIM-Select the card: Nano, Micro or Mini?
Xiaomi Redmi 3S It only supports Nano-SIM (format) 4FF, size 12.3 × 8.8 However, many users have successfully used cropped Micro-SIM or even Mini-SIM:
- 🟢 Nano-SIM (recommended option): Perfectly sized, no need to be trimmed. Minimum risk of contact damage. Easy to extract from the tray.
- 🟡 Micro-SIM (trimmed): You can trim to Nano-SIM with a special template or scissors, the risk of damage to contacts with careless trimming. In some salons, communications will be trimmed free of charge.
- 🔴 Mini-SIM (standard size): Requires considerable trimming, high risk of error. Not recommended without experience - better order an adapter. May not fit in the tray due to thickness.
If you only have a Micro-SIM or Mini-SIM, but you can not trim it yourself, contact your operator’s salon. Many operators (for example, MTS, Beeline, MegaFon) provide a trim service for free or for a nominal fee (50-100 rubles). Alternatively, order a Nano-SIM adapter on AliExpress or at local electronics stores.
💡
Before pruning SIM-Take a picture of the map on both sides, which will help you to restore contacts if something goes wrong.
How to trim Micro-SIM to Nano-SIM for Redmi 3S
If you decide to trim the Micro-SIM to the size of a Nano-SIM, follow this instruction. You will need sharp scissors, a pencil, a ruler and sandpaper (fine-grained).
☑️ Preparation for pruning SIM-map
Step-by-step:
- Put the Micro-SIM on the Nano-SIM template (can be found online) and circle the boundaries with a pencil.
- Carefully trim the plastic along the planned lines, leaving 1-1.5 mm of stock - then adjust the size.
- Clean the edges with sandpaper so that they become smooth and do not scratch the tray.
- Make sure that the metal contacts are not damaged or touch the edges of the plastic.
- Insert the cropped card into the tray and make sure it fits tightly but doesn't hang around.
⚠️ Note: If the phone does not see after the pruning SIM-check: Are the contacts affected (should be clean and whole) is the card inserted correctly (chip down, bent corner coincides with tray angle) has plastic debris entered the slot (blow or clean with a soft brush).
If you are not sure about your skills, it is better to use a pruning machine SIM-cards (costs about 200-300 rubles) or order a new Nano-SIM from the operator. For example, Tele2 and Iota give Nano-SIM by default, and other operators can replace the card for free in the cabin.
Hybrid Slots: How to Use Two SIM or SIM + microSD
The main feature of Xiaomi Redmi 3S — A hybrid slot that allows you to choose one of two options:
- Two Nano-SIMs: Ideal for those who use two numbers (e.g. work and personal).
- One Nano-SIM. + microSD: Suitable if you need to expand your memory (for example, for photos or music).
You can only switch between modes physically, you have to take out the tray and change the cards.
- 📶 4G It only works on one. SIM: If both cards are supported LTE, piece 4G Only the one you have selected will be active (Settings) → SIM-maps and mobile networks → Preferred network).
- 🔄 Reboot when changing cards: after replacement SIM MicroSD phone may require rebooting for recognition.
- 📱 MicroSD Limit: maximum supported volume is 256 GB, but it is better to use cards with a class not lower than the previous one. UHS-I (Class 10) for stable employment.
| Configuration | Advantages | Deficiencies |
|---|---|---|
| Two Nano-SIMs | Convenient for two rooms, no need to carry a second phone | It is impossible to use a microSD, 4G only one SIM |
| Nano-SIM + microSD | Expanding memory to 256GB, cheaper than buying a smartphone with a large built-in drive | It is impossible to use the second SIM, When the card is broken, data is lost. |
If you need two. SIM, and additional memory, consider alternatives:
- 📱 Use cloud services (Google Drive, Yandex.Disk) to store files.
- 🔌 Connect OTG-flash drive (adapter required) USB-C/OTG).
- 📲 Move some of the applications to SD-map (in settings Settings) → Annexes → [Select an application] → Memory. → Change).
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A hybrid slot is always a compromise. Decide what's more important: the second. SIM-card or additional memory and select the configuration for your tasks.
Compatibility with 4G operator selection
Xiaomi Redmi 3S supportive 4G LTE, but with some limitations:
- 📡 Supported ranges: B1 (2100), B3 (1800), B7 (2600), B38 (2600), B39 (1900), B40 (2300), B41 (2500).
- 🌍 Global version: works with most Russian operators (MTS, Beeline, MegaFon, Tele2).
- 🇨🇳 Chinese version: may not support some Russian frequencies 4G (for example, B20 (800 MHz for Tele2).
To check the compatibility of your SIM-map 4G on the Redmi 3S, Follow the following steps:
- Put it in. SIM-slot-card SIM1 (He's usually better at catching the net).
- Go to Settings. → SIM-maps and mobile networks → [Choose. SIM] → Preferred type of network.
- Choose. 4G (recommended 3G/2G (car, if 4G catcherless.
- Reboot the phone.
If 4G It's not working, check it out:
- 🔍 Does your operator support you? 4G in your area (check on the operator's website).
- 📶 Is the network correctly selected in the settings (sometimes the phone switches to the network itself) 3G).
- 🔄 Update the firmware to the latest version (in older versions) MIUI were bugs with 4G).
How do I check the firmware version?
If you travel frequently, pay attention to roaming rates.Some operators (such as MegaFon) offer lucrative packages for overseas trips, but require the activation of the roaming option at home. 3S can automatically switch to 2G, slowing down the internet.
Frequent problems with SIM-maps at Redmi 3S and their decisions
Xiaomi Redmi Users 3S Sometimes they face problems with SIM-Let's look at the most common cases and how to fix them.
| Problem. | Possible cause | Decision |
|---|---|---|
| The phone can't see. SIM-map | Bad contact, slot contamination, improper pruning | Clear the slot, reinstall the card, check the trimming |
| No network or often lost connection | Weak signal, incorrect network settings, damaged SIM | Manually switch network type, change operator, replace SIM |
| 4G It doesn't work. 3G/2G) | Unsupported range, disabled 4G customized | Check network settings, update firmware, change slot SIM |
| Phone's asking. PUK-code | Three times inducted infidel PIN-code | Enter. PUK (is indicated by the plastic SIM), throw off PIN |
If none of these methods worked, try the following:
- 🔄 Reset network settings: Settings → System and device → Resetting settings → Reset the network settings.
- 📱 Test. SIM in another phone: if the card does not work there, the problem is in the operator or the operator itself. SIM.
- 🔧 Update the firmware: old versions MIUI They may have recognition bugs. SIM.
- 🛠️ Contact the service: if the slot is physically damaged, you will need to replace the connector (cost) ~800-1500 rubles).
⚠️ Warning: If the network is missing after the firmware update, reset to factory settings (Settings) → The phone. → Reset settings. Pre-save important data!
Alternatives: adapters and multifunction trays
If you need to use two at the same time SIM-cards and microSD, but a hybrid slot Redmi 3S This is not possible, consider the following decisions:
- 🔄 Adapter "2" SIM + microSD": It allows you to insert two Nano-SIMs and a microSD into one tray. SIM Or a memory card when you're using it: ~300-500 rubles (for example, on AliExpress).
- ☁️ Cloud storage: Move photos and documents to Google Photos, Yandex.Disk or Dropbox. Plus: data is accessible from any device.
- 📁 OTG-Driver: Connect the flash drive through the adapter USB-C/OTG. Plus: you can use large amounts of memory (up to) 1 TB. Minus: flash drive sticks out of the phone, uncomfortable to wear.
When choosing an adapter for two SIM + microSD, note reviews - some cheap models can cause overheating or loss of network. It is better to buy adapters with a metal case and good reviews (rated at least 4.5).
If you are switching between configurations (these are two) SIM, piece SIM + microSD, keep a spare tray with the cards already cropped, save time for repositioning, and you can also use multifunction microSD cases, but it's less reliable than an embedded slot.