You can do this without a SIM card installed.
For older or specific chipsets (like MediaTek), you may be able to use community-developed tools like MTKClient which bypasses the official server check entirely, though these are advanced and carry higher risk. 2. Google Pixel Devices how to unlock bootloader without sim card
| Brand | Without SIM Possible? | Workaround | |--------|----------------|-------------| | | ✅ Yes | Wi-Fi + Google account wait period | | Samsung (Exynos) | ❌ No | Requires SIM for first unlock (use old inactive SIM) | | Samsung (Snapdragon/US) | ❌ Impossible | Bootloader permanently locked | | Xiaomi | ⚠️ Partial | Some models require Mi account + SIM; try Wi-Fi + 7-day wait | | OnePlus | ✅ Yes | No SIM needed, just OEM unlocking toggle | | Motorola | ✅ Yes | Wi-Fi + Motorola ID login | | Nothing Phone | ✅ Yes | Same as Pixel method | | Huawei (old) | ❌ No | Requires SIM for unlock code request | You can do this without a SIM card installed