: Go to Settings > About Device > Status . Scroll down to find the IMEI.

Once you have the IMEI, you can purchase a "SIM Network Unlock PIN" from specialized websites. Reliable options mentioned by various users and reviews include:

The IMEI is essential because the unlock code is generated specifically for your device's hardware. You can find it using any of these methods:

: Open the Phone app and dial *#06# . The 15-digit number will appear on your screen immediately.

: Remove the back cover and battery; the IMEI is printed on a sticker underneath the battery.