*#*#6484#*#*
in menus like Engineer Mode unless you are certain of what they do; some changes can disable network connectivity or sensors. Backup your data
Secret codes are sequences typed into your phone’s native dialer app (the same keypad you use to make calls). They usually start with *# or *#*# and end with # or #*#* . When entered correctly, the phone automatically executes a command without pressing the call button. How to Use Secret Codes on TCL 30 XL 4G
On the TCL 30 XL 4G (running Android 12 or later, with TCL’s UI), most standard MediaTek or Qualcomm codes work because the device uses a MediaTek Helio processor.
If you ever need to unlock your phone for use on another carrier or report it stolen, you need the International Mobile Equipment Identity number. While this is in the settings menu, typing this code is the fastest way to display it on your screen. Calendar Info Code: # #225# # *#*#6484#*#* in menus like Engineer Mode unless you
Secret codes, often called USSD (Unstructured Supplementary Service Data) or MMI codes, are strings of characters usually starting with an asterisk and ending with a pound sign. They are typed directly into the phone app dialer. When the final character is entered, the phone recognizes the sequence and triggers a hidden action or menu.
This error appears when the phone tries to send the code as a USSD command to the carrier instead of processing locally. Add a trailing comma (pause) or disable Wi-Fi calling temporarily. When entered correctly, the phone automatically executes a
This is the most important and safest code.
These codes are safe to run, but be careful. Some menus contain options that could affect your network or factory settings. Do not change anything unless you understand what it does.
Ensure you are on the Dial Pad (where you type phone numbers). Type the code exactly as written.
| ✅ Do | ❌ Don’t | |-------|----------| | Use *#06# to record IMEI safely | Change unknown engineer mode values | | Run hardware tests before buying used | Try “unlock” codes from random websites | | Check battery health monthly | Assume a code works on all phones | | Write down working codes for later | Factory reset without backup |
