Since you are operating without a SIM card, you must ensure other aspects of your setup are perfect.
: If "OEM Unlocking" is greyed out, connect to Wi-Fi. On some devices, you can force a check-in by dialling *#*#2432546#*#* in the phone app (no SIM required). Boot to Fastboot Mode : Connect the phone to a PC. Power it off, then hold Power + Volume Down (varies by model) to enter the bootloader screen. Execute Unlock Command : Use a terminal on your PC with Android Platform Tools installed: fastboot flashing unlock fastboot oem unlock Confirm on Device how to unlock bootloader without sim card
He factory reset the phone and skipped every setup screen possible. Once on the home screen, he connected to his home Wi-Fi and waited. Sometimes, just being online is enough for the phone to ping the server and realize it’s eligible for unlocking [2]. He tapped the "Build Number" seven times to become a "Developer," but the toggle remained a stubborn, ghostly gray [1, 5]. Then, he remembered an old trick: Offline Verification. Since you are operating without a SIM card,
If you tell me the exact device make/model and carrier (if any), I’ll provide a concise, model-specific step-by-step unlock guide without assuming a SIM is present. Boot to Fastboot Mode : Connect the phone to a PC