Connect to the device's web interface (typically http://192.168.8.1 ). Navigate to the settings menu.

These were the simplest forms, primarily based on the device's IMEI . Calculators for these versions became widely available early on, making most 3G devices trivial to unlock.

While V1 and V2 are universally free, most reliable V3/V4 calculation services are paid and require an active internet connection to verify against larger databases. How to Use an Unlock Code