Codes are derived from your device's unique 15-digit IMEI.
You cannot calculate a code without the IMEI. You can find this by: Checking the sticker under the modem cap or on the back. Codes are derived from your device's unique 15-digit IMEI
High-quality calculators use specific database lookups or proprietary algorithms provided by manufacturers. Codes are derived from your device's unique 15-digit IMEI