Xiaomi Redmi 9 supports the work with two SIM-It's convenient for users who combine work and personal numbers, but not everyone knows how to remove or replace cards correctly so as not to damage the tray or contacts. SIM-maps – from mechanical tray extraction to network priority software settings.
Many people face problems: the tray does not extend, the phone does not see the second one. SIM-We'll explain how to avoid these errors, and we'll also talk about hidden control functions. SIM into MIUI. If you just bought a Redmi 9 or are planning to change operators, this guide will help you do everything quickly and without risks.
Unlike the flagship models, the Redmi 9 has a hybrid tray that allows you to use either two nano-SIMs or one SIM + microSD memory card. This imposes restrictions: you can not insert two SIMs and a flash drive at the same time. Before replacing cards, make sure that you do not lose access to important data on the microSD - it will have to be temporarily removed.
Where is the tray for SIM-Redmi 9 and how to open it
Tray for SIM-The maps in Xiaomi Redmi 9 are located on the left side of the case, next to the volume buttons. It is easy to recognize by a small hole for a paper clip or a special key (comes with the phone). If the key is lost, an ordinary straightened clip or needle will fit - the main thing is that the tool is thin and not bent.
To get the tray out:
- Turn off your smartphone (recommended, but not required).
- Insert the paperclip into the hole to the point - the tray should be slightly pushed out.
- Carefully pull the tray on yourself without putting excessive effort.
Important: do not use sharp objects (knives, forks) so as not to damage the sealing ring of the tray. If the tray does not extend, check whether it is jammed due to deformation - in this case, it is better to contact the service center.
Make sure the phone is turned off (optional)
Prepare a paper clip or key from the set
Put your phone on a flat surface
Do not make excessive efforts in extraction-->
In the tray you will see two slots:
- 📱 Slot 1 – for nano-SIM (main card).
- 📱 Slot 2 – for nano-SIM or microSD (hybrid).
If you insert a microSD into slot 2, the second SIM-The card will stop working – this is a feature of the hybrid tray.
How to insert it correctly SIM-maps: order and orientation
Before installation SIM-Redmi 9 supports only nano-SIM (the smallest format) If your card is larger, it can be trimmed with a special adapter or in the cabin of the operator.
Installation procedure:
- Place the tray on a flat surface with contacts upwards.
- Put the first one in. SIM-Slot 1 card (usually marked as SIM1).
- If you need a second SIM, place it in slot 2 (don’t confuse it with a microSD connector!).
- Carefully squeeze the tray back into the phone before clicking.
Map orientation: The bevelled angle of the nano-SIM must match the slot recess, and if you insert the card incorrectly, the phone won't recognize it, and re-extracting it can damage the contacts.
What happens if you put it in? SIM-map?
After installation, turn on your phone and wait for the network to register. If one of the SIMs is not identified:
- 🔄 Reset the device.
- 📶 Check if the mobile network is on for this SIM customized.
- 🔧 Try to move the cards in places (sometimes slot 2 is less stable).
Setting priority SIM-card MIUI
The default Redmi 9 uses SIM1 for calls and mobile internet, but this can be changed. Go to: Settings → SIM-maps and mobile networks → Settings SIM-map.
Options are available here:
- 📞 Calls: Choose which one SIM default.
- 🌐 Mobile Internet: Assign the main SIM data-transmitting.
- 📤 SMS: choose SIM message-post.
- 🔄 Data Switching: Allow automatic switching to second SIM, if the main one is not available.
For example, if you have unlimited Internet on SIM1 and cheap calls on SIM2, you can configure:
- Internet via SIM1.
- Calls are via SIM2.
Tip: If one of the SIMs is used only for calls, turn off mobile internet to avoid accidental traffic consumption.
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In roaming, the phone can automatically switch to a more expensive SIM for the Internet. To avoid this, turn off the "Automatic Network Selection" option in the mobile data settings.
Frequent mistakes and their solution
Even with the right installation SIM-Redmi 9 users sometimes face problems:
| Problem. | Possible cause | Decision |
|---|---|---|
| The phone can't see. SIM-map | Incorrect installation, damaged card or contacts | Reinstall the card, wipe contacts with alcohol, check the card in another phone |
| There is no network on one of the SIMs | No registration in the operator’s network | Manually select the network in Settings → Mobile network → Operators |
| The mobile internet is not working. | Not configured access points (APNs) | Request APN settings from the operator or enter manually |
| The tray is jammed. | Dust hit, tray deformation | Contact the service center (do not try to pull out by force!) |
If, after the replacement, SIM-phone call card PIN-If you don't know the code, contact the operator, and after three wrong attempts, the card will be locked, and you will need to contact the operator. PUK-code (is on plastic carrier) SIM).
⚠️ Warning: If the phone stopped turning on after removing the tray, check if there are any fragments left inside. SIM-It can cause a circuit to occur.
How to switch between SIM-card-to-bell
During an outgoing or incoming call, you can dynamically switch between the two. SIM-For example, if you got a call from the SIM1, But you want to answer through SIM2 (better-than-expensive).
Make it easy:
- During the call, click on the screen to open the control panel.
- Slip the current SIM icon (it appears next to the number).
- Select another SIM from the list.
This function also works for outgoing calls: before dialing, click on the arrow next to the call button and select the desired SIM.
Limitation: if one of the SIM blocked PIN-code, switch to it during the call will not work - first you need to unlock the card in the settings.
4G and VoLTE Compatibility: What You Need to Know
Redmi 9 supports 4G (LTE) and VoLTE (voice over the Internet), but there are nuances:
- 📶 4G It only works on one. SIM — If you are using the mobile internet SIM1, The second card will be limited. 2G/3G.
- 📞 VoLTE is only available in the main SIM (The one used for default calls).
- 🔄 With an active internet connection on one SIM The second may temporarily lose the network.
To enable VoLTE:
- Go to Settings. → SIM-maps and mobile networks.
- Select the SIM you want.
- Activate the Call option via LTE (VoLTE).
If VoLTE is not working, check:
- Does your operator support this technology (check on the provider's website).
- Is the phone firmware updated (older versions of MIUI could have bugs with VoLTE).
⚠️ Attention: When using two SIM-Roaming card traffic may increase due to constant switching between networks.
Alternative management practices SIM-map
In addition to the standard settings, Redmi 9 has hidden features for working with SIM:
1. Quick switching in the notification curtain
Swipe down from the top of the screen to open the notification bar. SIM-You can click on the icon to show the network:
- 🔄 Switching the mobile internet between SIM.
- 📵 Disconnect the network on one of the cards.
2.Tune in. USSD-team
If you often need to check your balance sheet or manage the operator’s services, keep it safe. USSD-Teams to contact, for example:
Check your balance: *100# (check with your operator).
- To replenish the account: 121 [card number]#.
3 Use two WhatsApps on different SIMs
With the Dual Apps feature (Settings → Applications → Dual Apps), you can create a second WhatsApp account tied to a second SIM. This is convenient for separating work and personal correspondence.
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Redmi 9 cannot be used at the same time. SIM And microSD, if you need both. SIM-Cards, you will have to abandon the expansion of memory or use cloud storage.