Xiaomi Redmi 4 is one of the brand’s most popular budget smartphones, released in 2016, but still in demand due to reliability and simplicity. However, even such a proven device has nuances that can confuse a new owner. One of the first questions users face is how to insert SIM-Redmi 4 card if the tray is not retracted or the phone does not see the network?
In this article, we will discuss all installation options SIM-cards (including a hybrid slot), talk about compatibility with nano-SIM and micro-SIM, and give tips on how to configure the mobile network after installation. SIM microSD, which results in loss of communication or data.
What are they? SIM-The cards are supported by Xiaomi Redmi 4
Xiaomi Redmi 4 is equipped with a hybrid slot, which means: you can use either two nano-SIM cards, or one nano-SIM and a microSD card (up to 256 GB). SIM-MicroSD and cards are not possible, you have to choose.
Technical characteristics of the slot:
- 📱 Type SIM: nano-SIM only (3FF, 12.3×8.8 Micro-SIM or standard SIM It's not good without an adapter.
If you have a micro-SIM or an old one SIM, It can be cut to nano-format using a special stack for SIM-cards (sold in the communication salons) or scissors (carefully, according to the template!). However, it is better to contact the operator's salon for a replacement - it is free and safe.
Where is the slot for SIM-maps in Redmi 4
Xiaomi Redmi 4 trays for the SIM-The card is located on the left end of the case, next to the volume buttons, and it's easy to recognize from the small extractor clip hole (complete with your phone). If you lose the clip, you'll get an unbended stationery clip or a thin needle.
The outside of the tray looks like a small metal plate with a slot, and it has tags for proper installation. SIM-map:
- 🔹 SIM1: The main slot (works in all modes).
- 🔹 SIM2/microSD: Hybrid Slots (Select One of Them).
If you can't find the slot, check if you've confused it with a microphone (at the bottom) or a 3.5mm connector (at the top). On some Redmi 4 Pro versions, the tray may be on the right - check the model in the settings (Settings → Phone → Model).
How to distinguish Redmi 4 from Redmi 4A and Redmi 4 Pro?
Step-by-step instruction: how to insert SIM-map
Before installation SIM-If the battery is not removable (as in the Redmi 4), just hold the power button 5-7 seconds until vibration.
Turn off the phone (hold the power button)
Prepare a scraper or a thin object
Check the type SIM-maps (nano-SIM only)
Configuration: 2 SIM or 1 SIM + microSD
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Follow the instructions:
- Remove the tray: Put the paper clip in the hole on the left end before you click. The tray will extend 2-3 mm - carefully pull it on yourself. Don't put too much effort: if the tray does not come out, check if the tongue is bent inside.
- Install. SIM-Card(s): Put the nano-SIM in the slot SIM1 with the contacts down, cut corner to the body (see tags on the tray). For the second slot, choose either the second one. SIM, Or microSD. Don't install both. SIM memory card at the same time!
- Put the tray back in place: Carefully insert the tray back before the click. make sure it sits flat - skewings can lead to poor contact.
- Turn on phone: Hold the power button until the Xiaomi logo appears. After downloading, check for network presence in the status bar.
If you turn on the phone, you can’t see SIM-map, try it:
- 🔄 Reset the device.
- 📶 Manually select the operator in the settings (Settings) → SIM-maps and mobile networks → Choice of network).
- 🛠️ Carefully remove the tray and check if it has moved SIM-map.
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If the tray is jammed and it doesn't extend, don't try to pull it out by force. Put the phone on a flat surface, slightly press the tray on the back side (through a napkin) and try to remove it again with a paper clip.
Frequent Mistakes and How to Avoid Them
Even with the right installation SIM-Xiaomi Redmi 4 users face problems. Let's consider the most common:
| Problem. | Possible cause | Decision |
|---|---|---|
| The phone can't see. SIM-map | Poor contact, slot contamination, inactive SIM | Wipe the SIM contacts with alcohol, check the balance, reinstall the card |
| No network (only emergency calls) | Incorrect APN settings, operator lock | Update your APN settings manually or contact the operator |
| SIM-The map is defined, but no 4G | In the network settings selected mode 2G/3G | Go to Settings. → SIM-map → Preferred type of network and select 4G |
| Phone's asking. PUK-code | Three times inducted infidel PIN-code | Check the PUK with the operator (printed on an envelope with SIM or in your personal account) |
⚠️ Attention: If after installation SIM-The phone stopped turning on or constantly restarts, immediately remove the tray and check if a foreign object (for example, a fragment) got inside. SIM-This can cause a short circuit!
Another common mistake is to try to insert a micro-SIM without an adapter, in which case the contacts will not match, and the phone will either not see the card or damage it, and if you only have a micro-SIM, you'd better trim it to a nano-format template or replace it in the cabin of the operator.
Network settings after installation SIM-map
After successful installation SIM-The card may require additional network settings, especially if:
- 📶 You are using a new number or SIM operator.
- 🌐 The phone is not connected to the mobile Internet.
- 📞 No possibility to make calls (message "Not registered on the network").
Follow these steps:
- Activate. SIM-Card: If the card is new, it needs to be activated, usually automatically when you first call or SMS. Some operators (e.g. Tele2) require input USSD-command (e.g. *111#).
- Set up an access point APN: Go to Settings. → SIM-maps and mobile networks → [choose SIM] → Access points (APN). If the list is empty, click Add and enter your operator's settings. For most Russian operators, it is enough to select Reset to default).
- Select Network Mode: For maximum internet speed, go to Settings → SIM-map → Preferred network type and install 4G (or LTE). If the cover 4G weak, pick 3G linkage stability.
- Check roaming (if necessary): If you are abroad, enable roaming in Settings → SIM-map → Roaming, please note that this may incur additional costs.
If the internet still doesn’t work after setting up, try:
- 🔄 Reboot the phone.
- 📱 Temporarily disable the second SIM-card (if two cards are used).
- 📡 Manually select the operator network in Settings → Mobile network → Network operators.
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If after all the manipulations, the network does not appear, the problem may be the firmware of the phone. Update MIUI to the latest version in Settings → About Phone → System Update.
What to do if the tray is jammed or broken
One of the most unpleasant situations is when the tray is SIM-The cards are not being pushed out or stuck inside:
- 🔧 Mechanical damage (phone fall).
- 🧲 Getting dust or dirt into the slot.
- 🔄 Incorrect installation SIM-maps (skewing).
Solutions:
- Try to remove the tray by alternative methods: If the paper clip does not help, use: 📎 Thin needle or pin (carefully so as not to damage contacts). 🧲 Magnet (bring to the area of the slot - sometimes the tray shifts under the influence of a magnetic field). 📱 Software method: on some firmware, trays can be extracted through the engineering menu (enter ##4636## and select Phone Information). → SIM Slot).
Take apart the phone (extreme case):
If the tray is stuck inside, you'll have to take the back cover off.
- Turn off the phone and remove the battery (if removable).
- Tap the lid with a plastic spatula (start at the corner near the charging connector).
- Carefully remove the tray with tweezers.
⚠️ Warning: Disassembly voids warranty! If phone warranty, contact Xiaomi service center.
Contact the service:
If independent attempts were not successful, slightly press the tray on the back side (through a napkin) and take the phone to the workshop. The average cost of repairing the slot is 500-1500 rubles.
⚠️ Warning: Never use metal objects (knives, screwdrivers) to remove the tray - this can damage antenna contacts or the motherboard. Also do not blow into the slot with your mouth: moisture from the breath can oxidize the contacts.
Compatibility of Xiaomi Redmi 4 with telecom operators
Xiaomi Redmi 4 supports most Russian and foreign operators, but there are nuances:
| Operator. | 4G support | Features |
|---|---|---|
| MTS | Yeah (Band 7, 20) | You may need to manually configure APN for the internet |
| Beeline | Yes (Band 3, 7, 20) | Auto-tuning is operating stably |
| MegaFon | Yeah (Band 7, 20) | In some regions, the weak 4G signal on the Band 20 |
| Tele2. | Yes (Band 3, 7, 20) | Activation required USSD-team# |
| Yota | Yeah (Band 7, 20) | VoLTE (4G calls) may not work |
For stable operation of 4G, it is recommended:
- 📶 Use it. SIM-map (USIM).
- 🔄 Update firmware MIUI last-minute.
- 📱 In network settings (Settings) → SIM-map → Type of network to select 4G (preferably).
If the phone does not catch the network of a particular operator, check:
- 📡 Frequency compatibility: Redmi 4 does not support Band 28 (700 MHz), which is used by some overseas operators.
- 🔒 No blockage on the basis of IMEI (Check through *#06#).
- 📵 Network availability in your region (check on the operator's website).