Samsung’s approach is straightforward for international models: enable Developer Options, turn on OEM Unlocking, boot into Download Mode, and confirm with a long press of the Volume Up button. No SIM card required.
Disclaimer: This guide is for educational purposes. Unlocking a bootloader may violate carrier agreements. The author is not responsible for bricked devices, lost data, or voided warranties. Always verify your device's specific XDA-Developers forum thread before proceeding.
Many manufacturers void your hardware warranty the moment the bootloader is tripped. Essential Tools Needed A Windows, Mac, or Linux computer. A high-quality, original USB data cable. ADB and Fastboot binaries installed on your PC. Correct USB drivers for your specific phone manufacturer.
If you are buying a new phone specifically for development and you do not have access to a SIM card, avoid US-carrier branded models (Verizon, AT&T, T-Mobile). Instead, buy an international version (Global or "EEA" models), or any phone with a MediaTek Dimensity chipset. how to unlock bootloader without sim card
Smartphone manufacturers implement SIM card requirements as a security and anti-piracy measure. By forcing users to route bootloader unlock requests through a registered SIM card using mobile data, manufacturers achieve two goals:
Go back to the main menu and navigate to System > Developer Options .
Once the phone is in fastboot mode, type the unlock command: fastboot flashing unlock Use code with caution. Unlocking a bootloader may violate carrier agreements
Insert it into the device and bind your account in the . Remove the SIM once the binding is successful.
Always back up your persist partition using ADB before unlocking. Without it, sensors and Wi-Fi MAC addresses can be corrupted.
This happens if the device hasn't checked in with the manufacturer's servers. Connect to Wi-Fi, change the system time to a few days in the future, check for a system update, and restart. Many manufacturers void your hardware warranty the moment
| 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 |
However, some manufacturers (most notably Xiaomi) have implemented account-binding security measures that typically require a SIM card to verify your identity before granting an unlock. Understanding the Difference: Bootloader vs. SIM Unlock