If your phone is (no carrier lock), you can unlock the bootloader without a SIM using only Wi-Fi on most brands. Xiaomi is the only major holdout that used to require SIM – now even they offer a SIM-free path on newer software.
Download the tool from GitHub and install its required dependencies via the command line. Power off your Xiaomi device completely.
Type adb reboot bootloader and press Enter. Your phone will reboot into a screen with a fastboot logo. Type the unlock command corresponding to your device:
Note: If OEM Unlocking is greyed out, connect to Wi-Fi and wait. For carrier-locked (e.g., Verizon) Pixels, this option may be permanently disabled.
Run the universal unlock command: fastboot flashing unlock (For older devices, use fastboot oem unlock instead).
Unlocking a bootloader without a SIM card depends heavily on your device manufacturer. While many devices like and older Samsungs allow this with just a Wi-Fi connection, others like Xiaomi have strict requirements that typically demand a SIM card for account binding. Manufacturer-Specific Requirements The ability to unlock without a SIM card varies:
It stops resellers from mass-unlocking devices to flash unauthorized or ad-heavy software before selling them to consumers.
Type the following command to check the connection: adb devices Authorize the USB debugging prompt on your phone screen.