How to set a choice SIM-Maps when calling Xiaomi: a detailed guide

Choice SIM-Xiaomi's smartphone cards are one of those features that seems simple until you're faced with a lack of cards or a malfunction. SIM-It's tedious to change the settings before each call, and in this article, we'll look at all the ways to customize the choice. SIM-maps - from standard parameters MIUI Up to hidden features and workarounds for older firmware versions.

It is important to understand that the algorithm of the function depends on the version. MIUI (12, 13 or 14), smartphone models (e.g., Redmi Note 12 or POCO X5 We tested the instructions on the actual devices and assembled solutions for typical problems: when the option to choose is the choice. SIM disappeared after the update when the phone ignores the default settings or when the second SIM-The card is not displayed in the call menu at all.

If you have already tried to make a choice SIM-And you can't do it, you can't rush to reset the settings to the factory. There's a section in the article that uses alternative methods, including the use of an engineering menu and third-party applications. SIM-maps, we added tips on priority networks and battery saving.

Why Xiaomi is Automatically Choosing SIM-map and how to fix it

By default, Xiaomi smartphones on MIUI They try to guess which one SIM-Use the card to make a call based on the user's last choice or operator's settings, and this algorithm often crashes, such as the phone can persistently ring from the first one. SIM-cards, even if you always use the second one for work calls, and the reason is because the default settings for calls don't always work correctly.

To disable automatic selection and return to manual control, you need to:

• 📱 Open the Phone application (the tube icon on the home screen).
• ⚙️ Click on three dots in the upper right corner and select Settings.
• 🔄 Go to the section SIM-Maps and mobile networks (in some versions) MIUI — Double. SIM mobile).
• 📞 Tap on Default for calls and select Request each time.

If this item is missing or inactive, the problem may be related to:

• 🔄 An outdated version MIUI (up to 12.5 inclusive).
• 📵 Hardware restrictions on budget models (e.g. Redmi) 9A).
• 🛠️ Failure of the com.android.phone module (solved by resetting network settings).

Step-by-step instruction: how to enable the choice SIM-card MIUI 14 and 13

In the latest versions of Xiaomi firmware, the customization algorithm has changed a little. SIM-The maps can be hidden in different menus depending on the regional firmware (global, Chinese, European).We have compiled a universal guide that will suit most models of 2022-2026 (Xiaomi). 13T, POCO F5, Redmi Note 12 Pro+ etc.).

Follow this course of action:

1. Open the phone settings (cog icon).
2. Scroll down and select. SIM-maps and mobile networks.
3. Click on the line with your name SIM-maps, for example, MTS or Beeline).
4. In the menu, find the item Type SIM-maps and make sure that voice calls are selected (not just Data).
5. Go back and tap the default for calls.
6. Choose Ask Every Time (or Ask Every Time in English).

If the request item is not on the list every time, try an alternative path:

1. Open the Phone app.
2. Dial the combination ##4636## (Engineering menu opens).
3. Select Phone Information.
4. Scroll down to the block. SIM Information and check the status of both cards.
5. If one of them SIM It is displayed as Not Registered, re-extract and paste it.

Some firmware (e.g. Chinese) have a choice option. SIM-The card can be blocked by the operator, in which case it will help to change the firmware region or install a global version. MIUI via Fastboot.

Problem Solving: Why Choices Don’t Work SIM-map

Even after setting up correctly, users often find that the phone ignores the choice. SIM-Let's look at the typical causes and ways of eliminating them.

Particularly noteworthy is the problem of lack of a choice request. SIM-This is often due to the fact that one of the SIM-The card is configured only for data transmission (for example, for the Internet:

1. Go to Settings. → SIM-maps and mobile networks.
2. Choose a problem SIM-map.
3. Make sure that in the Type item SIM-Cards selected Voice calls and data (or Voice calls).
4. If the option is not available, contact the operator - it is possible that voice services are blocked on your tariff.

Alternative choices SIM-Maps: Applications and Hidden Functions

If the standard settings MIUI They do not allow flexibility to be managed SIM-And we've tested a few of these, and we've identified the most reliable ones.

1.Appendix Dual SIM Selector

This free app from Google Play lets you manually choose from SIM-A map for every contact:

• 📇 Tethering SIM-contact cards (for example, always calling your mother first) SIM, And to work with the second).
• 🔄 Quick switch between SIM-widget-card.
• 📊 Statistics on the use of each SIM-map.

To set up:

1. Install Dual. SIM Selector from Google Play.
2. Give the app permission to access contacts and calls.
3. In the app menu, select Default Settings and set up rules for contacts.

2. Engineering menu (for advanced users)

If you're ready to dive into the technical details, you can activate hidden options through the engineering menu.

Instructions:

1. Open the Phone app and dial ##4636##.
2. Go to the phone information section.
3. Choose the right one. SIM-drop-down.
4. Check the Set Preferred Network Type settings – sometimes reset to LTE/3G/2G (Auto) solves the problem of choice.

💡

If you often call numbers with different prefixes (for example, city and mobile), create groups in contacts and attach different prefixes to them. SIM-Dual cards SIM Selector. That'll save you time on manual selection.

Optimizing the two SIM-Maps: Tips for battery saving and network priority

Use of the two SIM-The cards simultaneously increase the load on the battery and the processor. To keep the smartphone running stable, and the battery goes down slower, follow these tips:

1. Network priority setting

If one of them SIM-The cards are used only for calls, and the second for the Internet, you can optimize their work:

• 📶 Go to Settings. → SIM-maps and mobile networks.
• 🔄 Choose. SIM-The card used for the Internet, and install only 4G (LTE) in the settings Network type.
• 📞 For SIM-Select the call cards 3G/2G — It'll reduce energy consumption.

2. Background activity shutdown

Many apps (such as messengers) are constantly scanning both of them. SIM-A card that drains the battery to limit it:

• 🔋 Go to Settings. → Annexes → Application management.
• 📱 Select an app (such as WhatsApp or Telegram).
• 🚫 In the Mobile Data section, disable background data transmission for unnecessary SIM-map.

3. Use of In-Air Mode for One SIM-map

If you need to temporarily disable one of the SIM-I don’t want to physically remove my cards (for example, at night), but I don’t want to physically remove them:

• ✈️ Turn on the plane mode.
• 🔄 Back to Settings → SIM-maps and mobile networks.
• 📱 Activate the right one. SIM-manual card (the second one will remain disabled).

💡

Shutdown 4G/LTE on SIM-The card, which is used only for calls, can increase battery life on the phone. 15–20%.

Frequent errors in setting up choices SIM-maps and how to avoid them

Many users make the same mistakes that lead to incorrect operation of the selection function. SIM-Let's look at the most common ones.

⚠️ Attention: Never take out SIM-card during an active call or data transmission, which may cause the module to crash RIL (Radio Interface Layer, after which the phone will not see both SIM-pre-reset maps.

Mistake 1: Using a hybrid slot for no purpose

On many Xiaomi models (e.g. Redmi 10 or X-rays) POCO M4 Pro) the second slot is combined with a memory card connector. If you insert a microSD, the second slot is the memory card slot. SIM-The card won't work:

• 📱 Remove the memory card if you don’t need it.
• 🔄 Use an adapter to SIM-MicroSD cards (if supported by the model).

Mistake 2: Incompatibility of operators

Some operators (especially virtual ones, such as Yota or the likes of the Tele2) They can conflict with each other at the firmware level:

• 📵 The phone only sees one thing. SIM-map.
• 🔄 When you call, the wrong network is automatically selected.
• 📞 Calls are dropped in a few seconds.

Decision:

• 📞 Check the compatibility of operators on the Xiaomi website (support section).
• 🔄 Try to change it. SIM-maps in places (first) ↔ second-second).
• 📱 Update your firmware to the latest version (sometimes bugs are fixed in new builds).

Error 3: Resetting settings after the update

After updating MIUI (especially large, for example, from 13 to 14 version of the setting SIM-They can throw the cards off to avoid it:

• 🔄 Before updating, back up the settings in Settings → The phone. → Backup.
• 📱 After the update, do not click Reset Settings if the phone prompts you to do so.
• 🔄 Manually check the settings SIM-maps and if necessary reconfigure them.

Xiaomi models: which are better to support the work with two SIM-map

Not all Xiaomi smartphones work equally well with two. SIM-We analyzed user feedback and specifications of the 2020-2026 models to compile a rating on the stability of Dual work. SIM.

If you are just planning to buy a Xiaomi smartphone and you need a stable work with two of them. SIM-Note the flagship models (Xiaomi) 13/14 series) or linear devices POCO F. Budget Redmis often save on the communication module, which leads to problems with Dual. SIM.

It is also important to note that the Chinese version of the firmware (China) ROM) choice SIM-The map may be restricted due to local regulatory requirements, in which case the flashing to the global or European version will help. MIUI.

FAQ: Answers to Frequent Questions about Choice SIM-maps on Xiaomi