Incoming call redirection is a basic mobile feature that is critical for business and personal comfort. Owners of Xiaomi Redmi 9 devices often face the need to redirect a call to another number when they are busy, offline or simply unavailable. Despite the fact that the MIUI interface has its own characteristics, the activation process of this option remains quite standard and understandable even for beginners.
But there are a lot of nuances that depend on your cell phone, your firmware version, and your current network settings, and sometimes the standard menu may not show you the right items, or the system will give you an error when you try to activate. USSD-codes that allow you to manage services directly through the operator's servers, bypassing the graphical interface of the smartphone. It is important to understand that forwarding is a paid service for most operators, tariffs may vary.
In this article, we will take a look at all the available methods for configuring call forwarding to Redmi 9. We will look at not only the standard settings in the phone menu, but also specific codes, and answer frequently asked questions about how the function works in roaming and when the device is off, which will allow you to always stay connected, even if the main phone is out of access zone.
Types of forwarding and their purpose
Before you start technically configuring, you need to clearly understand what kind of call forwarding options are available to the user. The GSM mobile networks that Xiaomi Redmi 9 uses have four main types of forwarding, each activated separately and has its own use cases, allowing you to flexibly manage incoming traffic.
The first and most common type is to forward all calls without exception. Regardless of your status (busy, free, unavailable), any incoming call will be instantly redirected to the specified number. Unconditional forwarding is often used when you go on vacation and want a colleague or secretary to take calls. When you activate this option, your phone will not call at all.
The second type is line-on-line redirection, and if you're already talking to someone on a second SIM card or messenger, the third one will be redirected, the third option is no-response redirect, which will work if you don't pick up the phone after a certain number of beeps, and the fourth type is forwarding when the subscriber is unavailable, which is when the phone is off or out of network coverage.
⚠️ Note: When using a “no response” redirect, the wait timer can be set rigidly by the operator (usually). 15-30 seconds), and changing it through phone settings is often impossible.
The difference between these modes lies in the logic of how the network works: When you configure the Xiaomi Redmi 9, the system sends a request to the operator’s server, which takes over the switch function, which means that even if your smartphone’s battery is completely drained, conditional forwarding (when busy or unavailable) will continue to work, since the network already “knows” your status.
Setup through the standard phone menu
The easiest and most visual way to manage call forwarding is to use the built-in MIUI shell interface. In Redmi 9, the path to these settings is standardized and does not require deep knowledge of the system. To start, open the Phone app, which is a standard dialer, and find a menu of additional settings there.
They are usually accessed through three dots in the corner of the screen or through the menu button. You need to find a section that can be called Call Settings, Additional Settings, or simply Redirect. The interface may vary slightly depending on the Android version and regional firmware (Global, EEA, China), but the logic remains the same. Once you log in, the system will try to read the current settings from the SIM card.
☑️ Checking before setting up
In the menu that opens, you'll see four tabs or items that match the types of redirects described above. By clicking on each of them, you can activate the function and enter your target phone number. Voicemail is often already written by the operator by default in some modes, so it's worth remembering the current values before changing your settings to keep access to messages.
It is important to note that to activate or change the settings through the menu, the phone must be in the zone of confident network reception. If the connection is unstable at the time of the request, Redmi 9 will give an error "Request error" or "Can not connect to the network", in which case it is recommended to switch the network mode (for example, from 4G to 3G) and try again.
⚠️ Note: If you use two SIM cards, the redirect settings apply only to the card currently selected for voice calls, or require a separate setting for each SIM card in the respective subsections.
Use of the USSD-call-management
In cases where the phone menu does not work, freezes or does not display the necessary options, help come to the rescue. USSD-It's a universal language of communication between the phone and the carrier's equipment. For the Xiaomi Redmi 9, these codes are standard for networks. GSM and work regardless of the firmware version or interface language.
To activate unconditional forwarding (all calls), the code *21* number phone# is used. For example, to redirect all calls to 89001234567, you need to dial *21*89001234567# and press the call button. Once the request is successfully completed, the operator will notify you that the service is activated, which is the fastest way to do not require a search on the menu.
There are also codes to undo redirects. The universal reset code for all types of redirects is ##002#. It's especially relevant if you forget you've turned on a redirect and can't reach your number. You can also turn off specific types of redirects: #21# disables all call forwarding, and #67# disables redirects when you're busy.
List of basic codes for Redmi 9
When entering codes on Redmi 9, it is important to observe the format of the number: in the international format, the number should begin with a plus or country code (for example, 7 for Russia), without an eight at the beginning, if the country code is used. If the code is entered incorrectly, the system will give a syntax error message. The advantage of the method is that it works even with a blocked SIM card (if there is one). PIN-code, you need to enter it first, or if you have problems with the interface MIUI.
Table of codes and descriptions
For the convenience of Xiaomi Redmi 9 users, we have organized the main commands into a single table, which will allow you to quickly find the desired code without having to reread long text descriptions. Save this information or take a screenshot to access it at any time.
| Action. | Activation code. | Cancellation code | Status check |
|---|---|---|---|
| All the calls | *21*number# | #21# | *#21# |
| Employment | *67*number# | #67# | *#67# |
| No answer. | *61*number# | #61# | *#61# |
| Unavailable. | *62*number# | #62# | *#62# |
| Total reset | — | ##002# | — |
Using status check codes (last column) to find out which number is currently being redirected and whether the service is active, which is useful if you use a Xiaomi Redmi 9 phone after buying from hand or a SIM card that you haven't used for a long time.
Remember, entering the code does not require confirmation of the call, just dial the combination. However, if you entered the activation code but forgot to specify the number (for example, *21#), the command will not execute. In some cases, instead of the number, you can use short service operator numbers to translate to the answering machine.
Specifics of working with two SIM-cards
Xiaomi Redmi 9 features a hybrid slot for two SIM cards, making the issue of configuring redirects for each of them especially relevant. Unlike single-board smartphones, you need to control two independent communication channels. Redirect settings are stored not in the memory of the phone, but in the SIM card profile on the operator side, but they are managed through the phone interface.
When you enter the call settings menu on Redmi 9, you will see the separation of SIM cards (SIM 1 and SIM 2). It is important not to confuse them by setting a redirect. Often users accidentally activate a redirect to the main number for the second SIM card, which leads to unexpected expenses or loss of important calls to the work number.
If you use one SIM card for the Internet and the other for calls, it makes sense to set up a redirect on the call card, but if both numbers are active for voice, you need to set up a redirect separately for each. USSD-codes, the command is applied to the SIM card that is selected for the default voice call at the moment, or to the one with which the set was made.
⚠️ Note: When using the ##002# code (full reset), make sure which SIM card is active at the moment. The command will only apply to the current active card for voice communication, the second will remain unchanged.
To separate the codes, you can use the SIM card selection function before dialing. On Redmi 9, when dialing, a "Select SIM" window often pops up if you don't have priority. Choose the right card, type the code, and the settings go well. This eliminates confusion and ensures that you don't turn off an important service on an unnecessary number.
Possible problems and ways to solve them
Despite the simplicity of the procedure, Xiaomi Redmi 9 users may encounter a number of technical problems, the most common being a “Request Error” or “Unable to Connect” message when trying to activate via the menu, often due to temporary disruptions in the operator’s network or improper APN settings, although the latter affects the Internet more.
Another common problem is that forwarding doesn't work, although status shows "On," which can happen if the number to which the call is being forwarded is also on or blocked, and the reason may be the carrier's prohibition to redirect to other carriers' numbers or international numbers, which requires contacting support.
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If the redirect doesn’t work, try to force the phone to 2G/3G Only for setup time. Sometimes on 4G/LTE networks, voice services (CSFB) may run late or conflict with VoLTE settings.
Another nuance is cost: Many users forget that forwarding is a paid service. The caller pays for the call before you at their operator's rate, and you pay for the forwarded call from yourself to the end subscriber at their operator's rates (often as an outgoing call, even if you're in your home region).
If you are abroad, it may not be economically feasible to use a forwarding to local numbers or numbers from other countries. In roaming, incoming calls redirected to a number in the host country may be charged as an international call. Always check the tariff conditions with your operator before traveling.
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Redirection to Redmi 9 is controlled by the operator’s network settings, so problems are most often solved by checking the balance, correctly entering the number and the absence of locks from the cellular company, rather than restarting the phone.