Have you ever encountered a situation where, during a call, the “Call Standby Signal” suddenly appears on the Xiaomi screen, and the conversation is interrupted or goes into a strange mode? It is not a system failure or a virus - this is the way a standard mobile communication feature works, which many users do not even know exists. In this article, we will discuss in detail what the call waiting signal on Xiaomi smartphones means, why it is activated and how to respond to it correctly so as not to miss important calls.
Communication errors, misunderstanding of network operation and even firmware bugs MIUI This can cause the call waiting function to fail, and we'll look at all the scenarios that we can think of, from the basic settings. SIM-You'll also learn how to distinguish normal network behavior from a technical malfunction that requires operator or service center intervention.
What is a Call Waiting Signal and How Does It Work?
Call Waiting is a standard mobile feature that allows you to receive a second incoming call without interrupting the current conversation. When you're on the phone and someone else is trying to reach you, the network sends a special signal to your device. Xiaomi, like other smartphones, displays this event with a notification on the screen.
Technically, the process looks like this:
- 📡 Your operator supports call waiting service (most of them are activated by default).
- 📞 During an active conversation, a second incoming call is received.
- 🔄 Network sends a call waiting signal to your Xiaomi.
- 📱 The smartphone shows a notification with a proposal to accept / reject a new call.
If the feature is disabled, the caller who tries to reach you will hear short “busy” beeps. On Xiaomi smartphones, the waiting signal can manifest differently depending on the version of MIUI and the device model. For example, on Redmi Note 12 it is a pop-up with buttons, and on POCO F5 it is an audible signal + a banner at the top of the screen.
Why Xiaomi has a call waiting signal for no reason
Sometimes Xiaomi users complain that the wait signal is triggered without a real incoming call — the screen is flashing, the sound is heard, but no one is calling.
| Reason. | Manifestation | How to check |
|---|---|---|
| Failure to work SIM-map | False incoming notifications | Restart your phone, check the card in another device |
| Problems with network coverage | The signal appears in the weak signal areas. | View the network indicator, switch to 3G/4G |
| MIUI firmware bug | Frequently triggered after update | Check the MIUI version, look for complaints on forums |
| Conflict with applications | The signal appears when using messengers | Start the phone in safe mode |
False positives are especially common on devices with two SIM-The fact is that the Xiaomi communication module can misinterpret signals from two operators at the same time. SIM The conversation is active and the second one gets SMS or USSD-The system sometimes perceives this as an incoming call.
⚠️ Note: If the waiting signal appears only when connecting to Wi-Fi calls, the problem may lie in the VoWiFi settings. → SIM-maps and mobile networks → Additionally. → Wi-Fi calls.
How to turn on or off waiting for a call on Xiaomi
By default, the call waiting function is activated in most carriers, but at the smartphone level, it can be turned off. Here's how to do it on different versions of MIUI:
Open the phone application
Press three points (⋮) top-right
Select Settings → Calls
Find Waiting for a Call or Additional Settings
Activate or deactivate the switch-->
On some models (such as Xiaomi 13 Pro or Redmi K60), the path may be slightly different:
- Go to Settings. → SIM-maps and mobile networks.
- Choose the right one. SIM-map.
- Slip on the additional settings.
- Find the Call Waiting (Call Waiting) option.
If there is no such item in the menu, it means that your operator does not support this service or it is blocked at the level of the service. SIM-In this case, you can do it:
- 📞 Call in support of the operator and request activation.
- 🔄 Insert SIM to another phone and check the settings there.
- 📱 Update firmware MIUI last-minute.
💡
If you often use two SIM-It is recommended to disable the waiting for a call on the one that is less often used for calls.
What to do if the call waiting signal does not work
Sometimes users have the opposite problem: the call waiting function doesn't work when someone tries to reach them during a conversation.
1. Check the operator settings:
Dial USSD- command *#67# is a call waiting service status request.
If the answer says “Deactivated”, contact the operator.2. Update your network settings:
- 📶 Go to Settings. → SIM-maps and mobile networks → [yours SIM] → Access point (APN).
- 🔄 Press three points (⋮) and select Reset the default settings.
- 📱 Reboot your smartphone.
3. Check compatibility with VoLTE:
On some Xiaomi models, for example, POCO X5 Pro) Call waiting may conflict with VoLTE technology. Try temporarily disabling VoLTE in the settings SIM-Check the cards and see if the wait will work.
⚠️ Warning: If after all the manipulations, the problem persists, your smartphone's communication module may be faulty, this is typical for devices that have fallen or come into contact with moisture.
Common mistakes when working with waiting for a call
Many Xiaomi users make common mistakes that cause the call waiting function to work incorrectly, and here are the most common ones:
- 🚫 Ignoring updates MIUI: Older versions of firmware often have network signal processing bugs. MIUI 12.5 There was a problem when the wait for the call was triggered with a delay in the 10-15 seconds.
- 🔄 Resetting without backup: After resetting to factory settings, call waiting settings return to default values, which may conflict with the current operator settings.
- 📱 Use of unofficial firmware: Castom builds (e.g. Xiaomi.EU or LineageOS) are sometimes mishandled USSD-commands that lead to false positives.
Another common mistake is that you use forwarding and waiting functions simultaneously, and if you have a call forwarding setup, the wait signal may not work properly, to check this:
- Dial *#21# and press the call.
- If the response contains numbers for forwarding, turn it off by the command ##002#.
- Reboot your smartphone and check the call waiting work.
What if a waiting signal appears during Internet calls?
How to distinguish a real expectation signal from a system failure
Sometimes it's hard to tell if someone is actually trying to reach you or if it's just a glitch on your smartphone, and here are the key signs that tell the difference between a real wait signal and a software failure:
| Sign. | Real signal. | System failure |
|---|---|---|
| Frequency of occurrence | Only during the conversation | Anytime, even when the phone is on standby. |
| accompanying | Short signal (usually one beep) | Repetitive sound or lack of sound |
| Display of the number | Shows the number or "Unknown" | Empty notification or random symbols |
| Responses to action | Disappears after you press "Decline" | It does not disappear or reappear in a few seconds. |
If you suspect that the call wait signal is triggered due to a hardware malfunction, perform the following diagnostics:
- Install a network testing application, such as Network Signal Info.
- Check the stability of the connection with the base station (RSRP should be above -100 dBm).
- If the signal is weak, try to force the switch to the network. 3G customized SIM-map.
💡
If false waiting signals only appear when you connect to a specific Wi-Fi network, the problem is most likely the router. Try changing the Wi-Fi channel or disabling the Smart Connect function in the router settings.
Additional settings for advanced users
If standard methods don't work, you can try deeper customizations, and be careful, because these actions require understanding how mobile networks work.
Manual change of modem parameters:
On some Xiaomi models (such as Mi 11 Ultra or Black Shark 5), you can manually configure communication options via the engineering menu.
Dial ##4636## → Select Phone Information → Network Selection.
Try manually specifying network mode (e.g., "LTE only").Reset modem settings:
- 📱 Go to Settings. → The phone. → All specifications.
- 🔄 Tap 5 times on the kernel version to open the engineering menu.
- 🛠️ Select Modem Reset and confirm the reset.
3.Use of ADB-team:
For experienced users, there is the option to manage call waiting settings via ADB:
adb shell settings put global call_waiting_enabled 1 # include
adb shell settings put global call_waiting_enabled 0 # deactivate⚠️ Note: Changes to the parameters of the engineering menu or use ADB-Before experimenting, back up the data and make sure you know how to return the settings to their original state.