To buy an unlock code for a Samsung Galaxy S5, you must first obtain your device's unique 15-digit and then purchase the code from a reputable third-party unlocking service . Unlocking a phone that is off-contract or paid off is legal and does not void your warranty. Step 1: Locate Your IMEI Number

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:

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