Discover hidden HyperOS features with these dialer codes

Contemporary smartphones feature complex systems beyond their graphical interfaces for monitoring hardware integrity, network, and power performance. Xiaomi’s HyperOS and MIUI environments enhance existing Android support functionality to include dedicated testing modes for engineers and advanced users. Such software can be considered In-System Diagnostics and Field Testing modes, playing a crucial role in assessing hardware functionality, debugging a network problem, or fixing a calibration problem.

CIT: The Heart of Hardware Engineering

In recent years, advanced The CIT interface is currently the best tool available for analyzing hardware status in a Xiaomi smartphone. The CIT mode disables all graphic effects as well as background processes to stress-test hardware components directly. Accessing the CIT menu involves the use of redundancy in order to allow technicians to test hardware irrespective of any software limitations. The most common approach involves dialing USSD code *#*#64663#*#* or *#*#6484#*#* (MIUI). An alternative approach involves going to Settings > About Phone > Detailed info and specs with a view to pressing the Kernel Version five times.

Technical Analysis of Hardware Components

The CIT menu offers a dynamic test menu that depends on the device profile.

Each step of the testing process generates a log file. In case a test does not pass, the system flags this as a hardware issue. This can be a very useful process to determine any hardware issues, such as a weak vibration motor or microphone, before buying a second-hand device.

Network Engineering and Connectivity Protocols

Network engineering refers to The mobile technology evolution has increased the complexity of network management. Xiaomi smartphones need to be compliant with the standards of hundreds of carriers worldwide. Sometimes, this can translate to the software-locking of supported technologies such as VoLTE and 5G.

Overriding Carrier Restrictions

Xiaomi phones usually do a “Carrier Check” to remove VoLTE/VoWiFi menus if the carrier has not “certified” the particular smartphone model. However, a user has to enter some specific codes to circumvent such checks:

• Activate VoLTE: *#*#86583#*#* – This disables the requirement for carrier approval, revealing the “Use VoLTE” toggle in SIM settings.
• Activate VoWiFi: *#*#86943#*#* – Similar to VoLTE, this enables Voice over Wi-Fi menus regardless of carrier profiles.
• 5G Standalone (SA) Toggle: *#*#726633#*#* – This makes the “5G SA” option visible, allowing for lower latency by leaving the 4G anchor.

Radio Telemetry (The 4636 Menu)

The code *#*#4636#*#* unlocks what is called the “cockpit” or the radio modem interface. Detailed signal strength in dBm units is given, rather than the bars represented on the phone. Network administrators configure the Set Preferred Network Type feature to set the phone to “LTE Only” or “NR Only” in order for it not to switch to 2G or 3G in low signal zones.

Critical System & Developer Codes

It is important to note that some codes might fail if the phone uses the Google Dialer rather than the MIUI Dialer, or if the network has set certain locks on the firmware.

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